Find the value of x in each triangle

The answer for number 1 is 48. the answer for number four is 90. you get your answer by adding the two degrees and subtracting it from 180.

Triangles' angles add up to 180 degrees, since a square has 360 and a triangle is half a square,
For the top one, 90+42+x=180, 90+42=132, 180-132=48, x=48
For the bottom one, 61+29+x=180, 61+29=90, 180-90=90, x=90

Domain= [0,18], Range = [0,31.50]

Step-by-step explanation:

If Charlie will only go to a single ride one time the possible rides he could go on would be 0 rides to all 18 rides for a domain of [0,18]. The output of the maximum and minimum x values would give us 0 dollars for riding 0 rides and 31.50 for riding all 18 (1.75 *0 = 0) and (1.75*18 = 31.50) so the range is [0, 31.50]