What is nine tenths in standard form?

I know it's simple but I forgot.

What is the Mad of the numbers 1530 1340 1425 1600 1530 1425

Angela pays $282 in advance on her account at the athletic club. Each time she uses the club, $10 is deducted from the account.

The graph of the function with the given values f (-2) = - 5 and f (4) = 4

The retail cost of a tv is 45% more than its wholesale cost. Therefore the the retail cost is how many times the wholesale cost

Grace starts with 100 milligrams of a radioactive substance. The amount of the substance decreases by 1/4 each week for a number of weeks, w. She writes the expression 100 (1/4) w to find the amount of radioactive substance remaining after w weeks.

Is this right? 3/4*5/9 = 5/12 in lowest terms

Use cross products to demonstrate whether the two ratios are equivalent in this problem: 4 over 6 times 14 over 21

A rectangle has 3 equal parts. What fraction represents each part.

How to find the sum of an math problem

You and a friend go to the movies and split the cost of the movie tickets and snacks. You pay the bill. You tell your friend he owes only $9 because you owed him $4 from the last time you went to the movies.