Sandy cut out 2 squares and 7 circles from a piece of cardboard. the length of the sides of each square was x inches and radius of each circle was y inches. the expression below shows how many more square inches of cardboard sandy used for making the circles than the squares:
7πy2 - 2x2
what does the term 7πy2 in the expression represent?

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

The value √10 and √15 are plotted on the number line

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.