-13
step-by-step explanation:
f(x)=2x-5 for f(-4)
f(-4) means let x=-4
f(-4) = 2(-4) -5
f(-4) =-8-5
= -13
problem:
f(x) = - 2/3x + 5; f(5/2)
substitute 5/2 in for x:
f(5/2) = -2/3(5/2) + 5
simplify the right side:
f(5/2) = -5/3 + 5
f(5/2) = 10/3
i hope this !