Answer 4^2+4=20 Explanation x^2+x=? so 4^2(4x4=16)+ 4 = 20
a = hours worked by the first mechanic
b = hours worked by the second mechanic.
since the first mechanic charges $55 per hour, then for "a" hours that'd be a total of 55*a or 55a, likewise, for the second mechanic that'd be a total charge of 80*b or 80b.
we know all hours combined are 15, so then a + b = 15.
we also know that all charges combined are $950, so 55a + 80b = 950.

Answer:
x= 175°
Step-by-step explanation:
angles in a triangle add up to 180 degrees
85 + 90 = 175
180 - 175 = 5 (the missing angle not x)
angles on a straight line add up to 180 degrees
180 - 5 =175
Answer:
The answer would be C. An obtuse equilateral triangle :)
perimeter = sum of all sides
27 = 9+7.8+x
x (third side) = 10.2