Asap!
three friends owe $18 to another friend for gas. if they plan to split the cost evenly, which of the following expressions could they use to find how much they each owe?

a. 18 ÷ -3
b. -18 ÷ 3
c. -18 ÷ -3
d. 18 ÷ 3

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

How do you write something in scientific notation?