Answers
Related Questions
Pekka tosses a ball out of a window that is 40 feet in the air. Its initial velocity is 15
feet per second. The path of the ball is represented by
h = -16t2 + 15t + 40
How long does it take for the ball to hit the ground (in seconds) rounded to the
nearest hundredth?
Answers
Answer:
2.12 seconds
Step-by-step explanation:
Given
[tex]h(t) = -16t^2 + 15t + 40[/tex]
Required
Determine how long the ball hits the ground
When the ball hits the ground means that [tex]h(t) = 0[/tex]
So, we have that:
[tex]h(t) = -16t^2 + 15t + 40[/tex] becomes
[tex]0 = -16t^2 + 15t + 40[/tex]
Reorder
[tex]-16t^2 + 15t + 40 = 0[/tex]
Multiply through by -1
[tex]16t^2 - 15t - 40 = 0[/tex]
Solve using quadratic:
[tex]t = \frac{-b\±\sqrt{b^2 - 4ac}}{2a}[/tex]
Where
[tex]a = 16[/tex] [tex]b = -15[/tex] [tex]c = -40[/tex]
So, we have:
[tex]t = \frac{-b\±\sqrt{b^2 - 4ac}}{2a}[/tex] becomes
[tex]t = \frac{-(-15)\±\sqrt{(-15)^2 - 4*16*-40}}{2*16}[/tex]
[tex]t = \frac{15\±\sqrt{(-15)^2 - 4*16*-40}}{2*16}[/tex]
[tex]t = \frac{15\±\sqrt{225 +2560}}{32}[/tex]
[tex]t = \frac{15\±\sqrt{2785}}{32}[/tex]
[tex]t = \frac{15\±52.77}{32}[/tex]
Split:
[tex]t = \frac{15+52.77}{32}[/tex] or [tex]t = \frac{15-52.77}{32}[/tex]
[tex]t = \frac{67.77}{32}[/tex] or [tex]t = \frac{-37.77}{32}[/tex]
[tex]t = 2.12[/tex] or [tex]t = -1.18[/tex]
But time can't be negative
So:
[tex]t = 2.12[/tex]
Hence, time to hit the ground is 2.12 seconds
The total for the two items (without tax) was $151.48. The price of the backpack was $65.49. What was the price of the calculator?
Answers
Answer:
The price of the calculator was $85.99
Step-by-step explanation:
Equation: 65.49 + x = 151.48 Subtract: x = 85.99A scientist was interested in studying if students beliefs about illegal drug use change as they go through college. The scientist randomly selected 104 students and asked them before they entered college if they thought that illegal drug use was wrong or o.k. Four years later, the same 104 students were asked if thought that illegal drug use was wrong or o.k. The scientist decided to perform McNemar's test. The data is below. What is the proportion of students that thought that is was wrong after college?
Answers
Answer:
gang gang
Step-by-step explanation:
Jen and Brandy are studying soil. They each collected a sample of soil from the front yard of the school and then analyzed its components. Finally, they compared their results and found that they were very different. Their findings are recorded in the chart below.
How should Jen and Brandy proceed?
A.They should discuss their results and try to figure out why they are different.
B. They should ignore the differences in their results and complete their lab report.
C. They should argue about which student is right.
D. They should ask their teacher which set of results are more accurate.
Answers
Answer:
A. They should discuss their results and try to figure out why they are different.
May I have Brainliest once you confirm that it's correct?
Answer:
C
Step-by-step explanation:
simply : b2 • b3 • b
(• = divide)
Answers
Answer:
Step-by-step explanation:
Is it b^2 divided by b^3 divided by b?
If so, the answer is 1/b^2
Choose the statistic that is considered a measure of spread.
Mean
Standard deviation
Mode
Median
Answers
Answer:
The standard deviation is considered a measure of spread.
Step-by-step explanation:
Standard deviation is basically considered a measure of spread, measuring how far data values are from their mean.
Standard deviation helps in determining the nature of the variation of the data about the mean.For instance, in certain data sets, we may observe the same mean, but their range could be different, and data values in one data set may have been closely concentrated near the mean than the other data set values.
For example,
considering the data set
[tex]15, 15, 15, 14, 16[/tex]
The given data set has a mean: 15
considering the second data set
[tex]2, 7, 14, 22, 30[/tex]
The given data set has also a mean: 15
But, the values in the second data set are clearly more spread out. When the values of a data set are not spread out largely, then the set will have a low standard deviation.
Therefore, the standard deviation is considered a measure of spread.
Kinda new at this can someone teach me how to work this app?
Answers
Answer:
you scan Ur question at the homepage
Step-by-step explanation:
if there's one, it'll show up
and yea u know how to ask a question so I won't explain XD
Answer:
yeah of course!! first don’t be a catfish cause i saw your profile pic on google (:<
Step-by-step explanation:
Find the density of a book with a mass of 24g and a volume of 5cm'.
Solve:
Given:
(24g) (5cm^3)
Answers
Answer:
The answer is 4.8 g/cm³Step-by-step explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{24}{5} \\ [/tex]
We have the final answer as
4.8 g/cm³Hope this helps you
Answer: 1.2 × 10-7 m3 kg
Step-by-step explanation:
(24g) (5cm^3)=1.2 × 10-7 m3 kg
Alison wants to distribute the carnations and roses equally among the 6 flower shops. Factor the expression from Part A using 6 as the common factor. How does the factored expression help Alison determine how many carnations and how many roses each flower shop should get?
Answers
Answer:
6
Step-by-step explanation:
sum of numbers 12-111
Answers
Answer:
12-111=-99
Step-by-step explanation:
Find the slope and y-intercept of the line in each graph.
PLEASE HELP ASAP
Answers
Answer:
slope m = -2, y-intercept b = 1
Step-by-step explanation:
The slope is the change in y over the change in x.
Equation for slope: y2-y1/x2-x1=m
Since they already gave us the two points we just have to decide which one is our y2,y1 and out x2,x1 (which one you chose does not matter). And plug the numbers into the equation and get: -3-1/2-0=m, in this case, m=-4/2 and simplify it into -2. Now we have our slope.
The y-intercept is where the line crosses over the y-axis, and in our case, it is given to us in the (0,1) so our slope is 1.
Hope this helps you
Passes through (-6,-1) and is parallel to y=-2/3x+1
Answers
Answer:
y=-2/3x-6
Step-by-step explanation:
y=mx+b
m=-2/3
y-y=m(x-x1)
y-(-1)=-2/3(x-(-6))
y+1=-2/3x-4
-1 -1
y=-2/3x-5
Answer:
[tex]y=-\frac{2}{3}x -5[/tex]
Step-by-step explanation:
Slope-intercept form:
[tex]y=mx+b\\\\y=(slope)x+(y-intercept)[/tex]
m is the slopeb is the y-interceptx and y are corresponding coordinate points (x,y)When two lines are parallel, their slopes are the same. Take the slope from the given equation and insert into the new:
[tex]y=-\frac{2}{3} x+b[/tex]
Now find the y-intercept. For this, insert the given coordinate points and the slope into the equation to solve for b:
[tex](-6_{x},-1_{y})\\\\-1=-\frac{2}{3} (-6)+b[/tex]
Simplify multiplication using the rule [tex]\frac{a}{b} *c=\frac{ac}{b}[/tex] :
[tex]-1=-\frac{2(-6)}{3} +b\\\\-1=-\frac{-12}{3} +b\\\\-1=\frac{12}{3} +b\\\\-1=4+b[/tex]
Use inverse operations to isolate the variable. Subtract 4 from both sides:
[tex]-1-4=4-4+b\\\\-5=b[/tex]
The y-intercept is -5. Insert:
[tex]y=-\frac{2}{3}x -5[/tex]
:Done
Sydney owns a small business selling used books. She knows that in the last week 125 customers paid cash, 5 customers used a debit card, and 9 customers used a credit card. Based on these results, express the probability that the next customer will pay with something other than cash as a decimal to the nearest hundredth.
Answers
Answer:
0.10
Step-by-step explanation:
rob bought 15 concert tickets worth $322.50. Floor tickets cost $25 each while balcony tickets cost $17.50 each. How many tickets of each type did rob bye?
Answers
Answer:
8 floor tickets and 7 balcony tickets.
Step-by-step explanation:
f+b=15
25f+17.50b=322.50
Answer:
8 floor tickets, 7 balcony tickets
Step-by-step explanation:
F + B = 15
25F + 17.50B = 322.50
Note your teacher will grade your response to ensure you receive proper credit for your answer a quadratic equation can be written in vertex form or in standard form
Answers
Answer:
vertex form: y = a(x – h)2 + k, where (h, k) is the vertex
standard form: y = ax^2 + bx + c
Step-by-step explanation:
not certain what the qustion is
If E[5X - 10) = 60, what is E[X]?
Answers
Step-by-step explanation:
here,
1o
so X is equal to 10
A segment of length 94 cm has been rotated degrees around a center . What is the length of the rotated segment?
Answers
Answer:
Rotation does not change lengths.
THIS IS MY 4TH TIME POSTING THIS (I did it on my other account )Abby has just started training for a marathon. She ran 15 miles in total during her first week of training. She wants to add an additional 2 miles to her weekly total during each subsequent week. Write an explicit rule for the arithmetic sequence that represents this situation, and use it to find how many miles Abby will run during her twelfth week of training.
Please show work for full credit
Answers
Answer:
She will run 202 miles in 12 wks.
Step-by-step explanation:
y = 17x + 15
15 represents the # of miles she ran in the first week.
17 represents the amount of miles she will run each week
x represents the # of weeks
y = the total # of miles in 12 weeks.
To solve plug in 11 for x since she ran 15 miles the first week she has 11 more to go.
y = 17(11) + 15
y = 187 + 15
y = 202
Hope this helps!
202 miles Abby will run during her twelfth week of training.
What is Algebra?A branch of mathematics known as algebra deals with symbols and the mathematical operations performed on them.
Variables are the name given to these symbols because they lack set values.
In order to determine the values, these symbols are also subjected to various addition, subtraction, multiplication, and division arithmetic operations.
Given:
let the number of weeks she walk x.
As she ran15 miles in the first week.
and, she run 17 miles in each week.
let y be the total of miles in 12 weeks.
Then, the equation can be
y = 17x + 15
y = 17(11) + 15
y = 187 + 15
y = 202
Hence, 202 miles Abby will run during her twelfth week of training.
Learn more about Algebra here:
https://brainly.com/question/24875240
#SPJ2
Triangles ABC and DEF are similar. Find e.
A.) 11
B.) 12
C.) 10
D.) 9
Answers
what is the slope of the line that passes through the points (2,-3) and (-2,5)
Answers
Answer:
-2
Step-by-step explanation:
m = 5-(-3) / -2-2
m = 5+3/-4
m = 8/-4
m = 2/-1
m = -2
Selena wants to sell hot dogs at a local sports arena. She must pay a fee of $25 $25 to sell hot dogs and estimates each hot dog will cost her $0.75 $0.75 . Selena plans on selling each hot dog for $2.00 $2.00 . What is the minimum number of hot dogs ( x x ) Selena needs to sell for the revenue to be greater than or equal to her cost?
Answers
Answer:
20
Step-by-step explanation:
Let the cost of 1 hot dog be $x.
2x ≥ 25 + 0.75x
2x - 0.75x ≥ 25
1.25x ≥ 25
x ≥ 20
Choose the equation below that represents the line passing through the point (−3, −1) with a slope of 4. (1 point)
A.) y − 1 = 4(x − 3)
B.) y + 1 = 4(x + 3)
C.) y − 3 = 4(x + 1)
D.) y + 3 = 4(x − 1)
Answers
Samir is getting balloons for his mother's birthday party. He wants each balloon string to be 9 feet long. At the party store, string is sold by the yard. If Samir wants to get 59 balloons, how many yards of string will he need?
Answers
Answer:
177 yards
Step-by-step explanation:
3 feet - 1 yard, so we have 3 yards for each balloon.
He wants 59 balloons, so 59 x 3 = 177
Nigel wants to average 85% on his four tests. He got 77%, 89%, 78% on his first three tests. What does he need to get on his last test to average 85%?
Answers
Answer:
He needs to get 96%
Step-by-step explanation:
Add 96 89 77 and 78 together and divide by 4, it should be 85
Plz plz help help help plz plz help plz
Answers
Answer:
since your adding to hours each time youll have 11, then the answer would be d the last one :)
Step-by-step explanation:
Answer:25.50 an hour
Step-by-step explanation:
(GRADE7MATH) Can somebody plz answer all the questions correctly and show ur answer..thanks!!
(Only if u done this before)
WILL MARK BRAINLIEST) :D
Answers
Answer:
7. 28
8. -40
9. 36
10. -18
11. -32
12. -49
13. -33
14. 30
Step-by-step explanation:
Multiply as normal. If the signs are different, the product is negative. If the signs are the same, the product is positive.
Answer:
7. 28
8. -40
9. 36
10. -18
11. -32
12. -49
13. -33
14. 30
Step-by-step explanation:
+ × + = +
+ × - = -
- × - = +
- × + = -
Please help! 30 points!
Use the numbers:
6 3 5 4 2 1
in that order to make 100. Use brackets and the four operations.
Answers
Answer:
(6*3+5+2)*4/1 or (6*3+4-2)*5/1
Step-by-step explanation:
Have a great day :)
Answer:
((6 x 3 + 4/2) x 5 ) / 1
Consider the line y = 2x–4.
What is the slope of a line parallel to this line?
What is the slope of a line perpendicular to this line?
Answers
Parallel slope = 2
This is because the original line has slope 2. Parallel lines have equal slopes.
--------------------------
Perpendicular slope = -1/2
The original slope 2 or 2/1 turns into -1/2 after flipping the fraction and the sign. Note the original slope and perpendicular slope multiply to -1. This is true for any pair of perpendicular lines where neither line is vertical.
Answer:
the slope of the parallel line is 2x
the slope of line perpendicular is -1/2
Step-by-step explanation:
Can Anybody Help With Geometry?
Answers
Answer:
SAS
Step-by-step explanation:
Side Angle Side: It shows only one angle and shows that 2 sides are congruent.
Answer:
It is SAS. Please mark brainliest.
Step-by-step explanation:
9 ≤ 6+ 9 < 9 solve for the inequality
Answers
Answer:
U cant solve this bruh lol
Step-by-step explanation: