A) R
Step-by-step explanation:
f(x) = 2 cos π x, but cos π = -1 therefore
f(x) = -2x, this is a line that has the slope m= -2, and goes trough the origin
the range is given by all the values of y so is R
answer: 48
just remember to use pemdas:
parentheses
expressions
multiplication
division
addition
subtraction
answer: about 22.67
step-by-step explanation: