What multiplies to make -10 and adds to make 11?

Sorry guys but as you have a small brain

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250