Danielle and tracy are building a rectangular sandbox. danielle has two boards that are equal in length, and tracy has two boards that are each 5 feet longer than danielle’s. they use the four boards as the four sides of their sandbox. use the variable x to write an algebraic expression to relate the perimeter of the sandbox to the length of one of danielle’s boards.

Step-by-step explanation:

Let

x -----> the length of Danielle's board in feet

y ----> the length of Tracy's board in feet

we know that

----> equation A

The perimeter of the sandbox is equal to

----> equation B

substitute equation A in equation B

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