Evaluate the expression when a=4 and b=20

b-5a

What was the greatest challenge cities faced as a result of rapid industrialization in the 1800s?

Tisha earns $ 6.50 an hour in the restaurant and around $ 10 an hour in tips. How much did you earn last week when you worked 20 hours?

What is the 20th term for the sequence of 0.125, - 0.250, and 0.500

Given that 1 kilogram = 2.2 pounds, which statements are true? Two kilograms is equal to 4 pounds. Three kilograms is greater than 6 pounds. Four kilograms is less than 8 pounds. Five kilograms is equal to 11 pounds.

A farmer's silo is shaped like a cylinder. The silo has a volume of 18,840 ft³. The height of the silo is 60 ft tall. What is the silo's radius? Enter your answer in the box.

What is the solution to 2x2 - 5x = - 8?

In a class of 26 student, 15 of them like maths, 13 of them like english and 9 of them don't like maths or english. Find the probability that a student chosen at random like english but not maths.

American car travels 32 miles on 1 gallon of gas European car travels 12.7 km on 1 L of gas which car gets better gas mileage explain your reasoning

78% of what number is 117?

The coefficients of the expression 2x^3-5x^2+x are: