What is a sample that does not fairly represent the population

Simplify 9r-2s-4r-3s

4. A laptop and a mobile phone were bought for 40000 and 24000 respective shopkeeper made a profit of 8% on laptop and a loss of 12% on mobile phone to find his gain or loss percent on the whole transaction.

1. Colored copies cost 10¢ per copy and white copies cost 5¢ per copy. Sandy made 400 copies, some of which were colored and the rest white. Her total bill was $22.50, How many colored copies and how many white cepies did she make?

18 boys in a class of 30 boys what's the percentage of the boys

Mariam, Anna and Sara divided 4800 shilling. Mariam got 1/4 and Anna 3/5 of all the money. How much money did Sara get?

Which two numbers add up to - 11 that multiply to - 432?

Ou are having a family-barbeque. In attendance are a grandfather, a grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one father-in-law, one mother-in-law and one

4x+3 solve the equation

Which represents an exterior angle of triangle XYZ? ∠LXZ ∠JXM ∠JXZ ∠HXJ

How many gallons of paint are required to paint the walls of a building having l = 50 ft w = 40 ft. h = 80ft. 1 gallon of paint can cover 500 square feet of the wall