Solve for r:
r over 15 = 4.3

1. r = 3.48
2. r = 64.5
3. r = 0.286

Mrs. gehrke said cheddar weighs 16.8 pounds. he actually weighs 15.2 pounds. what is the percent error?

Which number can each term of the equation be multiplied by to eliminate the decimals before solving? 5.6j- 0.12=4+1.1j

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?