What is 2x+y=12 3x-18=y

Answers

Answer 1

Answer: 2x+y=12: y=4

3x-18=y: x=2

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Could anyone help with math?? Will up vote, thanks!If a cone-shaped vase can hold 45 cubic centimeters of water and has a radius of 2 centimeters, what is the height of the vase? Use 3.14 for pi. Round your answer to the nearest hundredth.

7.45 centimeters
10.75 centimeters
14.33 centimeters
22.50 centimeters

Answers

Answer:

The height of the cone is 10.75 cm.

Step-by-step explanation:

Given the volume of cone = 45 cubic cm

Radius of the cone = 2 cm

Height of the cone = ?

The volume formula of cone is = $\pi r^(2) (h)/(3)$

$45= 3.14*2*2* (h)/(3)$

=> $45*3 =12.56h$

=> $135=12.56h$

h = 10.748 ≈ 10.75 cm

So, the height of the cone is 10.75 cm.

volume of a cone V = pi * r * r * h / 3
so V = 45, r = 2 therefore 45 = 3.14 * 2 * 2 * h /3 => 45 = 3.14 * 4 * h /3
=> 135 = 3.14 * 4 * h => 33.75 = 3.14 * h => 10.75 = h
height = 10.75 cm rounded to 2 decimal places

WHAT IS THE SQUARE ROOT OF 55

Answers

What is the square root of 55 =7.146

If you want the simplified version of the square root, its already in simplest form.

A spring has an original length L inches. When a weight of x pounds is suspended from the spring, its new length y is given by the formula y = L + x k , where k is a constant, measured in pounds per inch. Solve the formula for x. Show the steps in your work. The value of k for a certain spring is 2.5. The length of the spring is found to be double its original length when a 10 pound weight is suspended from it. Write the equation for the original length of the spring and solve it. Show the steps in your work.

Answers

The way I figured this one out was saying that if it takes 2lbs to stretch it to 12 inches and 5lbs to stretch to 18 inches that means that 3 additional pounds = 6 inches. Therefore, each additional pound is 2 inches. We know already that with 2 lbs it was 12 inches in length and we can also say that 2 lbs = 4 inches. So subtract 4 from 12 and you end up with the answer of 8 inches.

The product of (a + b)(a − b) is a perfect square trinomial.
A. Sometimes b. Always c. Never

Answers

never
perfect squre trinomial is in form
(a+b)(a+b) or (a-b)(a-b)
that is not equal to (a+b)(a-b)

never

Answer:

C. Never

Step-by-step explanation:

How do you make a dollar using only 30 coins

Answers

Well you could use 15 pennies, 7 dimes, and 3 nickels to make a dollar. It is only 30 coins and it makes a dollar.

U would use

25 pennies , 2 quarters , 1 nickel and one dime

That is 30 coins used and makes a dollar ...

( give Jennifer credit if u like sense she figured it) :)

A measurement can be precise without being accurate.
a. True
b. False

Answers

The answer is B. false. Being precise in a measurement needs to be accurate and exact in details. without one factor of its doesn't prove that it would be relevant in information because the measurement is not exact and accurate

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