suppose the population of a certain city is 3987 thousand. it is expected to decrease to 3157 thousand in 50 years. find the percent decrease.

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?

The amount cami raised during last year’s charity walk, $45.50, is 7/10 of the amount she raised this year. which equation represents n, the number of dollars she raised this year?