Joanna has a total of 7 rolls of coins worth $23. She has rolls of dimes worth $5 each, and rolls of nickels worth $2 each.
How many rolls of each kind does she have?

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?

Find the domain and range of the following function f(x) = 51x - 21+ 4

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.