Tina completes a 26 mile marathon in 150 minutes, what is her speed in mph

The average human heart beats 72 beats per minute. how many times does it beat in 15 seconds?

How do you answer this question? (step by step)

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.