Answer:
91
Step-by-step explanation:
Substitute 4 in place of x
f(4)=20*4+11
f(4)=80+11
f(4)=91
Answer:
9% sales tax
Step-by-step explanation:
44.10/490 =
.09
.09 as a percentage is also 9%
If 5 and less then D but if just less than 5 then B
Answer:
x=35, y=21
Step-by-step explanation:
A way to rewrite the first equation is 
after cross-multiplying, we get 3x=5y.
If we solve for one variable, we can substitute it into the other equation.
Let's solve for x.
3x=5y
x=(5/3)y
Now, we can substitute x=(5/3)y in the equation x+y=56.
(5/3)y+y=56
(8/3)y=56
y=21
Going back to x+y=56, we can now plug back in y, knowing that it is 21.
x+21=56
x=35.