Desmos Graphing Calculator

CalcReferenceCopy

Math·Algebra·Linear equations in one variable

easy

The number of soil samples, s, that Sonal needs for her experiment is given by the formula $s=2r+\frac{r}{2}$, where r is the number of rows in the field. If Sonal has 30 rows in the field, how many soil samples does Sonal need?

A

60

B

75

C

85

D

90