Answer:
A. 8.09 × 10^-5
Step-by-step explanation:
4.1 x 10^-6 = 0.0000041
0.000085 - 0.0000041 = 0.0000809
0.0000809 = 8.09 x 10^-5
Concept: Basic Multiplication
B.) x + (x + 16) = 90
2x+16=90
2x=90-16
x=74/2
x=37
