If f(x) = x, then f(64) is equal to

a. 1/4
b. -8
c. -4
d. 4

An equation where variables are used to represent known values—function notation true or false

Can someone answer this question? : )

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)