Rearrange the formula S = a / (a - r) for r.

How much is saved from earnings of $400?

The average sea-level in 1900 at London-bridge was 33 feet. In 1990 it was 33.08 feet. Use linear interpolation or extrapolation to find: ( a. What the average sea-level was in 1935. ( b. In what year the average sea-level will be 40 feet.

Greg invests $2,680 in a CD paying 7.0% interest, and $3,060 in an online savings account paying 4.5% interest. How much more interest will the CD have earned than the savings account after 1 year? a. $25.90 b. $49.90 c. $380.00 d. $499.00

What is the slope of the line 3+4x=2y-9

How many tens and 15 ones = 6 tens 5 ones

What is 2 3/5 + 1 3/5

Credit card A has an APR of 15.8% and an annual fee of $72, while credit card b has an Apr of 19.6% and no annual fee.

At another school they sell a different brand of gift wrap which costs $2 per package and cards for $5 per package. Your friends class sells 220 packages and earns a total of $695.

A publisher prints 1,912 copies of a book in each print run. If they print 305 runs, the manager wants to know about how many books will be printed. What is a reasonable estimate?

On Saturday, you catch insects for your science class. Five of the insects escape. The remaining insects are divided into three groups to share in class. Each group has nine insects. How many insects did you catch on Saturday?