16.65 (explanation) i used a calculator. hope this helps you!
Answer:
square root of 34
Step-by-step explanation:
ok so S is for Squared
Cs= As+Bs
5s+3s= Cs
25+9=34
Cs=34
C= square root of 34
to get C we need to square root Cs
square root of 34
so C is 5.83
Brian-90×5+85=535
Christina-90×5+65=515
So after 5 weeks Brian will do 535 push ups and Christina will have done 515.
The answer is 820 (520+300)
