Can you do 8th-grade math?

Functions

100

If f(x) = x + 2, find f(3)

5

200

If f(x) = 2x, find f(6)

12

300

If f(x) = x², find f(4)

16

400

If f(x) = x − 5, find f(10)

5

500

Is y = 3x + 2 linear?

yes