How would i solve 7r=-7/2? i know the answer is -1/2 i just don't understand how to get -1/2 as my answer.

Which measurement is the most precise? a) 29 cm b) 28.8 cm eliminate c) 28.76 cm d) 28.762 cm

What is the number 321,000,000 in scientific notation? also what is the number? ?

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks