What is a? how do you solve it?

1/9a-7=1

Write 8389 in scientific notation.

Erica and Veronica are making different color backpack tags to sell at school.  They decide to sample the population of 300 students to find out what colors students like best.

Shannon sells handmade wallets for $12 each. Yesterday, she sold n wallets. Today, she sold 3 fewer wallets than yesterday. Over the past two days, she earned a total of $396.

A rational function of the form y = a / (x - h) + k has asymptotes at x = 4 and y = - 2. Write the equations of two different functions that meet this description.

A used desktop computer sells for $430, which is 75% reduction from the original price. What was the original price of the computer?

A woman plans to use one fourth of a 48 foot x 100 foot rectangular backyard to plant garden. Find the perimeter of the garden if the length is 40 feet greater than the width

Bryan played two baseball games last weekend. He got 7 hits in all. He had 3 hits in the first game. How many hits did he get in the second game?

True or false? it is possible to circumscribe a circle about the quadrilateral below.

A real estate agent sells a house for 87,000. She gets a commission of 6% on a sale. What is her commission

The function f (x) varies directly with x, and f (x) = 12 when x=8 which answer is the direct linear equation? a) f (x) = 8x b) f (x) = 12x c) f (x) = 2/3x d) f (x) = 3/2x