If n = 15, what is the value of the expression below?

6.21 + n * 13 - 30.3

A. 245.43

B. 170.91

C. 231.51

D. 366.933

A group of 3 children and 2 adults pay a total of $120 to take a karate class. A group of 5 children and 1 adult take the same karate class for $95. What is the total cost for 1 child and 1 adult to take the karate class?

Connor drives an an eighteen-wheeler. It cost Conner $456 to fill the truck up with diesel fuel. If diesel fuel cost $3 a gallon, how many gallons of fuel were bought? A) 148 gallons B) 152 gallons C) 156 gallons D) 164 gallons

Leslie, Inc., followed the practice of depreciating its building on a straight-line basis. A building was purchased in 2016 and had an estimated useful life of 25 years and a residual value of $20,000.

ralph and alphonse are shooting marbles. ralph has 5 more marbles than alphonse, and they have a total of 73 marbles. how many marbles does each of them have?

Tamara can mow 2 acre in one hour. If her yard is 2 acres, how many hours will it take her to mow the entire yard?

Keith has p pennies, n nickels, and d dimes in his pocket. the total number of coins is 9. the expression 0.01p+0.05n+0.10d0.01p+0.05n+0.10d represents the value of the coins, which is equal to $0.53. he has two fewer nickels than dimes.

Is 2468 a rational or irrational number

A 15 foot ladder is leaning against a wall. if the foot of the ladder is sliding away from the wall at a rate of 10 ft/sec, at what speed is the top of the ladder falling when the foot of the ladder is 9 feet away from the base of the wall?

A word problem using system of linear equations of form Ax+By=c Problem: a fruit company delivers fruit in 2 types of boxes. Large and small. A delivery of 3 large boxes and 5 small boxes had a total weight of 77 kilograms.

Kit bought a soft drink and a sandwich for $9.00. What was the price of each if the sandwich cost 3.5 times as much as the soft drink?