Jane thinks of a number, x, multiplies it by 7 and writes down the result. Andrew also begins with x, then multiplies it by 5, adds 18 and writes down the result. Given that Jane and Andrew write down the same result, work out the value of x.

x = 9

Step-by-step explanation:

Jane writes 7x

Andrew writes 5x + 18

The 2 expressions are equal , so

7x = 5x + 18 ( subtract 5x from both sides )

2x = 18 ( divide both sides by 2 )

x = 9

9

Step-by-step explanation:

✓ 7x

✓ 5x + 18

5x + 18 = 7x

18 = 7x - 5x

18 = 2x

18 2x

=

2 2

x = 9

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere