A. 83°
B. 90°
C. 97°
D. cannot be determined

90

Step-by-step explanation:

c is perpendicular to b

That means angles 5,6,7,8 are 90 degrees

a is parallel to c

That means b is perpendicular to a

That means that 1,2,3,4 are 90 degrees

<1 = 90 degrees

$450

step-by-step explanation:

first, you have to multiply 150x2=300

next, you have to add 150+300= 450

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant