9x-1=11 how would I solvr this problem

Elizabeth is making a volcano for her science project. She determines that the radius of the base of the volcano needs to be 2.5 inches and the slant height needs to be 8.5 inches.

In September, there were 16 members in the music club. In October, the number of members was 24. What was the percent increase from September to October?

What is the total for a $4.70 item with a 6% sales tax with a 20% off discount?

What is a positive coterminal angle to 47° that is between 500° and 1000° and a negative coterminal angle to 47° that is between - 500° and 0°?

Graph this equation Y=3x

Megan has 30 brownies and 42 cupcakes to package. She wants to put the same numbers of brownies and cupcakes in each box. What is the greatest number of boxes she can make? How many cupcakes and how many brownies will each box contain?

Making h the subject of the formula t=gh:10

The volume of construction work was increased by 60% but the productivity of labor increased by only 25%. By what percent must the number of workers be increased?

Simplify the expression (9 + 21) (9 - 21).

What is area in math and for what do you use area for?