The answer is 20% because 4/20 equals 1/5 which is 20%

It should be x=11 instead of x=-11, so
he is not correct because he made a sign error.
Answer:
B
Step-by-step explanation:
f(x) = y = x^2 + 7
x = y^2 + 7
x - 7 = y^2
sqrt(y^2) = sqrt(x - 7)
y = +/- (x - 7)
Answer B
Answer:
$22.50
Step-by-step explanation:
$4.50x5=$22.50