Question

please help
Evaluate the expression when r = 8.2 and s = –3.7.



r – 2s









A.
–22.94







B.
0.8







C.
4.5







D.
15.6

Answer 1

Substitute. 
r – 2s ⇒ 8.2- 2* -3.7
$8.2-2*-3.7 \\ use -pemdas \\ 8.2-(-7.4) \\ 15.6 \\ Answer- D.15.6$