1. C
L=1/2(Pxl)
L=1/2(20x9)
L=1/2(180)
L=90
SA=1/2(Pxl)+B
SA=90+5^2
SA=115
B, A, C, B.
$35 per ticket
the unit rate means the cost of 1 ticket
divide $420 by 12 for unit rate
= $35 per ticket
Answer:
x = 3 and 7
There are two true solutions.
Step-by-step explanation:
To solve
, use inverse operations by squaring both sides of the equal sign.

The quadratic expression can be factored into binomials and set equal to 0 by the zero product property to find x.
(x - 3) ( x - 7) = 0
x-3 = 0 so x=3
x-7 = 0 so x=7
Now check each solution into the original equation to be sure it solve the solution and is not extraneous.

and
[/tex]
Drop parentheses -7a-19c+12a+30c+21a-11a
Combine like terms -18a-19c+33a+30c
Combine like terms (again) 15a+11c
Simplified, this expression is 15a+11c