Nine less than a number

A piano teacher charges $30 for a one hour lesson, and $50 for a two hour lesson. She works for 25 hours in one week, and earns $690. Determine how many two hour lessons she gave.

Merchandise was sold by an agent totaling 4,500 her rate of commission was 8% what was her commission

Wo students have to be chosen as monitors in a class of 36. in how many ways can this be done? in how many ways can two students be chosen as monitors, one from the girls and another from the boys, from a class of 36 if there are 18 girls and 18

Can you simplify this expression [3+4*8 - (16/4+10) ]

Choose the correct simplification of (9x3y2) 2. 18x5y4 81x5y4 18x6y4 81x6y4

You select a card at random from the cards that make up the word replacement without replacing the card, you choose a second card. find the probability of choosing a vowel.

jake hase a mac 11 and want to go on a shooting with 8 magazines and 25 bullets in each magazine, how many bullets are in the mac 11? and how many people can he end if he missed 90 shots because he is a mobile kid?

Trevor has $8 in savings and adds $1 each week. Aretha has $12 in savings and adds $3 each week. After how many weeks will Aretha's account have twice as much as Trevor's account?

What is the interest earned on $400 invested at the rate of 6% for one year?

Which ordered pair is a solution of the equation? A - Only (4,-1) B - Only (5,2) C - Both (4,-1) and (5,2) D - Neither