To multiply 0.75 by 2.8 × 10^-⁵, we multiply the two numbers together and keep the same exponent for 10.
0.75 x 2.8 × 10^-⁵ = 2.1 × 10^-⁵
Therefore, the answer is C. 2.1 × 10^-⁵.
Multiply 0.75 by 2.8 × 10^-⁵.
A. 2.1 × 10^-⁷
B. 2.1 × 10^-⁴
C. 2.1 × 10^-⁵
D. 2.1 × 10^-⁶
1 answer