HELP!!!
Find the exact solution of x. 3x2 + 7 = 28

Answers

Answer 1

Answer:

2.65 I think I am not sure but the solution

Step-by-step explanation:

3x² = 28 - 7

3x² = 21

x² = 7

x = 2.65

Answer 2

Answer:

x = ± [tex]\sqrt{7}[/tex]

Step-by-step explanation:

Given

3x² + 7 = 28 ( subtract 7 from both sides )

3x² = 21 ( divide both sides by 3 )

x² = 7 ( take the square root of both sides )

x = ± [tex]\sqrt{7}[/tex]


Related Questions

Evaluate 42,147÷63. Round to the nearest whole number, if necessary.

Answers

Answer:

669 is the answer to this equation

Step-by-step explanation:

brainliest?

Answer:

669

Step-by-step explanation:

Define constant of proportionality.

Answers

Answer:

Step-by-step explanation:

The constant of proportionality is the constant value of the ratio of two proportional quantities x and y, typically the equation is Y=KX. The constant of proportionality is, the value of Y is dependent on how the given value of X is effected by the constant of proportionality.

What is the slope of a line parallel to y = 10?

Answers

Answer: y=6

Step-by-step explanation:

because y=10 is a vertical line so you can put any number in y= ____

how many times do 8 go into 18?

Answers

Answer: 2.25

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Answer:

2.5

Step-by-step explanation:

hey can anyone pls answer dis math question rq!

Answers

Answer:

9 inches

Step-by-step explanation:

Original size = 6 ftScale factor = 1/8

Clone = original * scale factor

Clone size

6 ft*1/8 = 3/4 ft

Converted to inches

1 ft = 12 in3/4 ft = 3/4 * 12 in = 9 in

Efectuar el cuadrado de un binomio: ( x – 2y ) ^2 =Respuesta necesaria. Opción única.
(1 Punto)
x^2 – 4xy + 4y^2
x^2 + 4xy + y^2
x^2 – 4y^2
x^2 – 2xy + 4y^2

Answers

Answer:

La opción correcta es;

x² - 4·x·y + 4·y²

Step-by-step explanation:

La ecuación dada es (x - 2·y) ²

(x - 2·y) ² = (x - 2·y) × (x - 2·y) = x·x + x × (-2·y) + (-2·y) × x + (-2·Y) × (-2·y)

Lo que da;

(x - 2·y) ² = x² - x × 2·y - 2·y × x + (-2·y) ²

De lo que tenemos;

(x - 2·y) ² = x² - 2·y × x - 2·y × x + 4·y² = x² - 4·y × x + 4·y²

∴ (x - 2·y) ² = x² - 4·y × x + 4·y² = x² - 4·x · y + 4·y²

Y el resultado del cuadrado simplificado es (x -  ·y) ² = x² - 4·y × x + 4·y² = x² - 4 · x · y + 4·y²

La opción correcta es (x - 2·y) ² = x² - 4·x · y + 4·y².

How do you solve this?

Answers

Answer:

145

Step-by-step explanation:

180-137=43

43+102=145

Answer The answer is 145 because, as you see you need a 180 degree angle, so you have 137 and you need to make those two angles 180 so 180-137=43 so then you got 43+102 so that's 145 then you have that other angle so that'll be 35, so the ? mark will be 145 since that 180-35

Step-by-step explanation:

V=\pi r^{2}h solve for pi

Answers

Answer:

The formula for the volume of a cylinder is V=Bh or V=πr2h . The radius of the cylinder is 8 cm and the height is 15 cm. Substitute 8 for r and 15 for h in the formula V=πr2h .

there are 9 water bottles in devin's fridge. he adds two cases that are each missing a bottle of water. when he is done, there are 31 bottles in the fridge. how many bottles are in a case?

Answers

Answer:

12

Step-by-step explanation:

Add two to the number of water bottles (33), subtract 9 (24) and divide in half, giving you 12.

Find the LCM (least common multiple) of 13 and 52.

LCM =

Answers

52,  because 52 is a multiple of 13 (13*4 = 52)

Answer:

The answer is 52


Rotate (1,4) 90 degrees clockwise.

ANSWER FAST PLZZ! will give brainliest

Answers

Answer:

(4,1) I believe. Do you mean in a graph with coordinates?

Step-by-step explanation:

(-1,4) i believe is the answer

what is the answer?​

Answers

The first one is 3.94times 10^3 and the second is 8.1 times 10^-2

Someone please help with this !!!!

Answers

Answer:

x = 132

Step-by-step explanation:

The 2 angles shown are alternate exterior angles and are congruent, thus

x = 132

Find the slope between the given points. REMEMBER: Slopes must be simplified.
(-10, 13). (5.-3)

Answers

Answer:

The slope is m= -16/15

what are you guys doing for Halloween lol I honestly am not feeling it this year

Answers

Answer:

im going to have fun with the fam and  shifted one unit right and 5 units up

Step-by-step explanation:

Answer:

Me nether

Step-by-step explanat

Shifed 1 unit left and then 5 units up

What number should be placed in the box to help complete the division calculation?

Answers

Answer:

260

Step-by-step explanation:

What is the y-intercept in this problem?

Answers

The y-intercept is -3

Answer:

y = -3

Step-by-step explanation:

The y-intercept is where the graph crosses the y-axis. The graph is seen crossing the y-axis at y = -3, the that y-intercept is at y = -3.

What does a1 stand for?

Answers

Answer:

It stands for like top quality, the best of the best

Step-by-step explanation:

first rate or excellent/first class

a certain map shows two roads. road a is 1 1/4 miles long but is 1 1/2 inches long on the map. what the unit rate for inches per miles on this map? if road b is 10 miles long, how long is road b on the map?

Answers

Answer:

30 inches

Step-by-step explanation:

Length of road A = 1¼ miles

Length of road A on map = 1½ inches

Unit rate for inches per miles on the map = 1½ inches ÷ 1¼ miles = ³/2 ÷ ⁵/4 = ³/2 × ⅘ = ⁶/5 inches per mile

Length big Road B on map:

Road B actual length = 10 miles

Thus, using the unit rate of ⁶/5 inches to 1 mile, length of road B on map would be calculated as shown below:

⁶/5 × 10 = 6*5 = 30 inches

Road B is 30 inches long on the map.

Which equation shows a proportional relationship between x and y?

y = 16

y = 7x

y=−7x−2

y = 9x + 1

Answers

The equation that shows a proportional relationship is y = 7x.

How to find the equation that is proportional?

Two variables have a proportional relationship if all the ratios of the variables are equivalent.

In other words, a proportional relationship is one in which two quantities vary directly with each other.

Therefore, a proportional relationship can be represented as y = kx.

where

k = constant of proportionalitythe variables are x and y

Therefore, y varies directly as x in a proportional relationship.

Hence, the equation that shows proportional relationship is y = 7x as 7 is the constant of proportionality. y and x are the variables.

learn more on proportional relationship here: brainly.com/question/20213987

#SPJ1

Answer:

y = 7x

Step-by-step explanation:

the proportional relationship is y = 7x as 7 is the constant of proportionality. y and x are the variables.

The snack bar at the school purchases water bottles at wholesale and then marks them up to make a profit. It marks up the water bottles by 33 and one-third percent, an amount of $0.28. What was the wholesale price of each water bottle?

Answers

Answer:

$0.84

Step-by-step explanation:

0.28 x 3 = 0.84

0.28 0.28 0.28

                      =  0.84

33% 33% 33%

Answer:

0.84

Step-by-step explanation: 0.28 + 0.28 + 0.28 = 0.84. i added it 3 times because you will divide by 3

what is the coefficient of a^8b^2 in the expansion (1/3a^2 - 4b)^6​

Answers

Step-by-step explanation:

(1/3a^2-4b)^6 for such an expansion the general term is

[tex]tr + 1 = \binom{6}{r} \times ( \frac{1}{3} {a}^{2} ) ^{6 - r} \times (4b)^{r} [/tex]

we want b^2 so r=2

so the formula transform to:

C6,2*(1/3)^4*a^8*4^2*b^2 so the coefficient of a^8b^2 is

(6*5/2*1)*(1/3^4)*4^2=

6*5*4*4/2*3*3*3*3=16*5/27=80/27

how many sixteenths are there in 7/8

Answers

Answer:

14/16

Step-by-step explanation:

If you multiply 8 by 2 you get 16 so multiply 7 by 2 and you get 14/16

14
Bolve for the value of z:
5
Z
25

Answers

Answer:

The answer is 15

Step-by-step explanation:

Thats what I got

A student performed the following steps to find the solution to the equation
+14x+8 = 0. Where did the student go wrong?
Step 1. Factor the polynomial into (X + 8) and (x-6)
Step 2. x+8 = 0 or x-6=0
Step 3. x= -8 or x = 6
A. in Step 1
B. The student did not make any mistakes, the solution is correct
C. in Step 2
D. in Step 3

Answers

Answer:

In step 2

Step-by-step explanation:

you were suppose to subtract them

You supposed to subtract it

Help Please ASAP!!! anyone?!?

Answers

Step-by-step explanation:

This angle can be written in three different ways -

∠RST ∠S∠TSR

Therefore,

Options A, B, C are correct.

Mofor had some candy to give to his three
children. He first took two pieces for
himself and then evenly divided the rest
among his children. Each child received
four pieces. With how many pieces did he
start?

Answers

Answer:

He started with 14 peices of candy

Step-by-step explanation:

We know that there are three children and each gets 4 pieces so we do 3x4=12 and then add the 2 that he took for himself which gives us 14.

Solve for the slope of the graph.

Answers

Answer:

-3/4

Step-by-step explanation:

rise/run

^^^you go up 3 and move left 4

Diep is saving money so he can buy a used car in 12 months . The total cost of the car he wants is $1450. Diep determines that he needs to save $120 each month to be able to afford the car what error did diep make

Answers

Answer:

He is a little off so if you use a calculater (dont know if your teacher allows you to but my teacher says they only work if you know how) youll get a little over 120 so you would need (if you round up) 121 Hope this helps sorry if im wrong   :)

55.6666666667 as a fraction

Answers

Answer: Step-by-step explanation:

What is 5.56666666667 as a fraction?

To write 5.56666666667 as a fraction you have to write 5.56666666667 as numerator and put 1 as the denominator. Now you multiply numerator and denominator by 10 as long as you get in numerator the whole number.

5.56666666667 = 5.56666666667/1 = 55.6666666667/10 = 556.666666667/100 = 5566.66666667/1000 = 55666.6666667/10000 = 556666.666667/100000 = 5566666.66667/1000000 = 55666666.6667/10000000 = 556666666.667/100000000 = 5566666666.67/1000000000 = 55666666666.7/10000000000 = 556666666667/100000000000

And finally we have:

5.56666666667 as a fraction equals 556666666667/100000000000

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