Evaluate the expression x - 7, if x = 12. 19 17 6 5

Keep in mind that whenever you have a variable inside an expression, you have to think of it as a placeholder, hiding a certain value which we haven't specified yet.

Expressions with variables are a mean to express the generic idea underneath the expression, rather than its particular value.

So, an expression like x-7 represents the idea of subtracting 7 from a particular number. Once you give a specific value to x, the expression will become an actual subtraction between numbers, and you will be able to compute its value.

So, we have several values for x, which are several ways to turn our "abstract" subtraction into an actual, computable subtraction.

If , the expression becomes and it evaluates to .

If , the expression becomes and it evaluates to .

If , the expression becomes and it evaluates to .

If , the expression becomes and it evaluates to .

If , the expression becomes and it evaluates to .

pls ask

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