Alex rents a car for one day . The charge is $18 plus $0.12 per mile. Alex wants to spend exactly $30 . How many miles can he drive?

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year. how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

Does anyone know how to do geometryme with this problem

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.