The function f(x) = 5x converts a nickels to pennies. Find a function that converts pennies to nickels. Then convert 50 pennies to nickels.
f-1 (x) = x/10. 50 pennies is equivalent to 5 nickels.
f-1(x) = 5/x. 50 pennies is equivalent to 5 nickels.
f-1(x) = x/5. 50 pennies is equivalent to 10 nickels.
f-1(x) = 5/x. 50 pennies is equivalent to 10 nickels.

Do you mind if you guys me with this question i’m on number 8

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?

Marcy is conducting a study regarding the amount of time students at her school spend talking to friends online. which group would give marcy the best results for her study?