Answer 1) both have spent $30 on the 5th day
Complementary angles are adjacent angles which add to equal 90 degrees (a right angle). To find m∠A in these figures, set the sum of the known angle measure and the unknown angle measure, A, equal to 90 and solve.
10)
90 = 67 + A
23 = A
m∠A = 23°
11)
90 = 57 + A
33 = A
m∠A = 33°
12)
90 = 44 + A
46 = A
m∠A = 46°
There are 4 variables in the expression. The variables are: a,b,c and d.
8d^2 = variable d
2bc = variables b and c
10ab = variables a and b
S is 30 degrees :) triangles are 180 degrees and you already know the measure of two, so if you add 85+65 you get 150. the. you subtract 180-150 and you get 30!