Please help. I've been working on this problem for more than 2 hours. Thank you. three support beams for a bridge form a pair of complementary angles. Find the measure of each angle.

20° and 70°

Step-by-step explanation:

(4x-10)+(2x-20)=90

6x-30=90

6x=90+30

6x=120

x=20

2(20)-20=20

4(20)-10=70

20+70=90

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.