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3 years ago

Find the product. (3x - 2)(2x + 5)

Mathematics

1 answer:

Viktor [21]3 years ago

4 0

FOIL METHOD
6x^2 + 15x - 4x - 10
combine like terms
6x^2 + 11x -10

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The volume of a cylinder is 628 cm^3. Find the radius of the base if the cylinder has a height of 8 cm. Round your answer to the

dalvyx [7]

I did the problem and checked it on google and did the formula on paper. You would 628= 3.14 * x(squared) * 8, then you would undo everything, leaving you with x= 5

I tried my best, and I don't know if they wanted you to use pi or 3.14 so I hope this is correct :]

7 0

4 years ago

An inlet pipe on a swimming pool can be used to fill the pool in 2020 hours. The drain pipe can be used to empty the pool in 212

boyakko [2]

Answer:

If the pool is 2/3 filled and then the inlet pipe and drain pipe are opened, it will take 140 hours to fill the pool

Step-by-step explanation:

An inlet pipe can fill the pool in hours = 20

Inlet pipe 1 hour work = $\frac{1}{20}$

A drain pipe can empty the pool in 21 hours

Drain pipe 1 hour work = $\frac{1}{21}$

Inlet pipe and drain pipe 1 hour together work = $\frac{1}{20}-\frac{1}{21}=\frac{1}{420}$

Now we are given that the pool is 2/3 filled

So, remaining portion to be filled = $1 - \frac{2}{3} = \frac{1}{3}$

So, Inlet pipe and drain pipe fill $\frac{1}{420}$ in hours = 1

So, they can fill 1/3 in hours = $\frac{1}{\frac{1}{420}} \times \frac{1}{3} =140 hours$

Hence If the pool is 2/3 filled and then the inlet pipe and drain pipe are opened, it will take 140 hours to fill the pool

6 0

3 years ago

Sara is getting ready for work. She has black pants, blue pants, grey pants, a red shirt, a green shirt, a white shirt, a blue s

Nady [450]

Answer:

3 pants

3 shirts

2 sweaters

just multiply 3x3x2= 18 combinations

7 0

3 years ago

12+20/x = 10 solve for x

weeeeeb [17]

Answer: x=−10 ..,.,.,.,.,.,.,..,.,.,

5 0

3 years ago

Please answer full question below thank you

Yuliya22 [10]

Explanation:

Angles 1 & 2 have to equal 180. So, if ∠1 is equal to 140, ∠2 is equal to 40 because 140 + 40 = 180.

So far... we know that:

∠2 = 40
∠9 = 80

Angles 2, 9, and 11 make a triangle, a triangles "magic number" is also 180. To get 180, you must add up all of the angles. Well... we don't know ∠11 so to find it, you subtract 40 & 80 from 180. 180 - 80 - 40 = 60.

Answer:

∠2 = 40

∠11 = 60

7 0

4 years ago