I need help with all of them please

Answer:

18=18

Step-by-step explanation:

a=90-b

a=50 mL at 4%

b=40 mL at 40%

check

0.04*50+0.4*40=0.2*90

2+16=18

18=18

Answer:

B

Step-by-step explanation:

Answer:

b

Step-by-step explanation:

Answer:

tan A = ± 1/√3 or ± 0.58

Step-by-step explanation:

2 ways to solve this question.

1. cos 2A = 1/2       2A = 60° or 300° or 420° or ....

   A = 30° or 150° or 210° ....

  tan A = tan 30° or tan 150° or ... = ± 1/√3

2. cos 2A = 2 cos²A - 1        1/2 = 2 cos²A - 1     cos²A = 3/4

   cos 2A = 1 - 2 sin²A         1/2 = 1 - 2 sin²A       sin²A = 1/4

   tan²A = sin²a/cos²A = (1/4) / (3/4) = 1/3

   tan A = ± 1/√3 or ± 0.58

Answer:

2.2:1

Step-by-step explanation:

Found the cube root of 1331

[tex] \sqrt[3]{1331} = 11[/tex]

Reciprocal of 0.2 is

[tex] \frac{1}{0.2} = 5[/tex]

Our ratio is 11:5. Our right hand number must equal 1 so we divide 5 by both sides.

[tex]11 \div 5 = 2.2[/tex]

So our n is 2.2

Answer:

2.2:1

Step-by-step explanation:

Answer:

c is incroccet aand other are correct

Answer:

12/40

Step-by-step explanation:

12/40=3/10

Answer:

358 people

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

For a relation to be a function, the ordered pairs do not repeat any of the x values.  This is Answer C.

Answer:

27,000 in.3

Step-by-step explanation:

Answer:

its 27,000 I got it right lol thanks to the person ^^^

Step-by-step explanation:

add me on sc whyhate_naya

Answer:

13.312 * 10^24

Step-by-step explanation:

=> (2.37)^3 * 10^24

=> 13.312 * 10^24

Please mark my answer as the brainliest for further answers :)

Answer:

B. 4x+5

Step-by-step explanation:

First, you multiply both sides by 4, then you have x=y-5. You then add 5 to get 4x+5

(in the very beginning, you switch the x and y so you would have to make the equation x= y-5 / 4 if that confused you)

Answer:

Should be 63 degrees

Step-by-step explanation:

I can't tell if that's one of your options.

Answer:

x= -10

Step-by-step explanation:

Answer:

B. k=7

Step-by-step explanation:

28/4=7

56/8=7

84/12=7

etc... good luck!

Answer and Step-by-step explanation:

[tex]\frac{9}{10}[/tex] ÷ [tex]\frac{4}{10}[/tex]

([tex]\frac{2}{5}[/tex] × [tex]\frac{2}{2} = \frac{4}{10}[/tex])

[tex]\frac{9}{10}[/tex] ÷ [tex]\frac{4}{10}[/tex] = [tex]\frac{90}{40} = \frac{9}{4} = 2.25[/tex] - This is the answer.

#teamtrees #PAW (Plant And Water)

Answer:

2000 linear feet

becouse 21-19=2 so thats his profit per linear foot

and it costs him 4000 so to get that amount he has to sell 2000 because 2000×2=4000

Answer:

11 boxes of candles

Step-by-step explanation:

first, set it up as an equation. let x stand for the amount of boxes she needs.

100=8x+15

next, subtract 15 from both sides of the equation.

100-15=8x+15-15

85=8x

then, you need to get x by itself. to do this, divide 8 from both sides of the equation.

85/8=8x/8

x=10.62, but you can't buy half a box, so you have to round up.

so, she needs to buy 11 boxes of candles.

Answer: B. (60 x 5) + (2 x 5)

Step-by-step explanation:

Answer:

if there are answer choices i would put the closest one to 16

Answer:

57

Step-by-step explanation:

Let c represent the number of children ($1.75 each) and a represent the number of adults ( $2.00 each).

We know that there were 340 people total, so c + a = 340. This implies that a = 340 - c

We also know that $1.75 c + $2.00 a = $609.25

By substituting a with 340 -c we have $1.75 c + $2.00 (340 -c) = $609.25

Use the distributive property to obtain $1.75 c + $680 - $2.00 c = $609.25

Subtract $680 from both sides and combine like terms to get - $0.25 c = -

$70.75

Now, divide both sides by -$0.25 to get c = 283, the number of children.

The number of adults is 340 - c or 340 - 283 = 57

Step-by-step explanation:

1st - false

2nd - true

3rd - false

Answer:

it is true, true, false. your welcome

Answer:

the probability is 0.25

Step-by-step explanation:

first flip if head:0.5

second flip after head:0.5 each

first flip if tails:0.5

second flip after tails:0.5 each

0.5 x 0.5 = 0.25

Answer:

x=9

Step-by-step explanation:

Since, these angles are identified as vertical angles, both sides are equal to each other. So, in order to solve this problem, we have to set the equations equal to each other: (7x+3 = 10x-24).

Answer:

Volume of given figure = 113.12 cm²

Step-by-step explanation:

Given:

Radius of cylinder = 4/2 = 2cm

Radius of cone = 4/2 = 2 cm

Height of cylinder = 7 cm

Height of cone = 6 cm

Find:

Volume of given figure

Computation:

Volume of given figure = Volume of cylinder + Volume of cone

Volume of given figure = πr²h + (1/3)πr²h

Volume of given figure = (22/7)(2)²(7) + (1/3)(22/7)(2)²(6)

Volume of given figure = (22/7)(4)(7) + (1/3)(22/7)(4)(6)

Volume of given figure = (22)(4) + (22/7)(4)(2)

Volume of given figure = 88 + 25.14

Volume of given figure = 113.12 cm²

Step-by-step explanation:

The perimeter is the sum of all sides.

AB+AC+CB=75

(2x-9) + (2x+3) + (3x+4) = 75

Combine like terms:

(2x+2x+3x) + (-9+3+4) = 75

7x - 2 = 75

7x = 77

x=11

Replace 'x' with '11' in the above equations to find that:

AB = 2(11) - 9 = 22 - 9 = 13 m

AC = 2(11) + 3 = 22 + 3 = 25 m

CB = 3(11) + 4 = 33 + 4 = 37 m

13 + 25 + 37 = 75 m

Answer:

10

Step-by-step explanation:

2/5 yard = 0.4 yard each piece

4 / 0.4 = 10