Which expression is equivalent to the expression -28 - 14?

27 is what percent of 108? 27 is % of 108

Can someone me and do the problem plz so i can understand it more better

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