9a-10=15b and 18a-20=100b. Find all solutions for a and b.

The total cost of a party is $185. If the cost is shared equally by f friends, how much does each friend spend?

Alan owns 40% more stocks than bonds. If he owns $380 in stocks, how much money does he have invested in bonds?

Line s passes through (2, 5) and is perpendicular to 5x-4y=20. If line s is written in y=mx+b notation, find b.

Many economists think that the price of oil has a negative, linear relationship to stock prices. Suppose that the stock market has a base value of 5,000 points even when oil is free or the price of oil is zero. Years later, economists realize that the actual base value of the stock market when oil[…]

A food blogger from America travels to England to critique English cuisine. When eating out, the blogger buys a dish that costs 22.50 British Pounds. There is an additional 12% sales tax. The blogger spends 37.65 US Dollars. What is the exchange rate in British Pounds per 1 US Dollar? 0.73 0.67 0.64 0.62 0.58

Kathy is on vacation in Japan. How much Yen can she get if she only has 100 US Dollars to spend? The exchange rate is 119.48 Yen per 1 US Dollar. There is also a 6% fee on the converted amount. 14,682.95 11,231.12 12,664.96 13,476.98

Krista is going on a road trip using a rental car. There is an untaxed base fee of $8 and then each mile is $0.05 and taxed at 0.5%. What is the total cost (c) of the car if Krista drives for m amount of miles? c(m)=1.05(0.05m)+8 c(m)=0.05(0.05m)+8 c(m)=1.005(0.05m)+8 c(m)=1.005(5m)+8

Jan’s printer can print 435 pages per cartridge when doing about 4 pages per minute. How many cartridges are used when the printer is running for 3 hours? 1.66 1.72 1.76 1.82

12 swimmers compete for gold, silver, and bronze. How many winning sets can be formed?