If f = a + b give the value of f with its error if a = 21 ± 3 and b = 18 ± 4.

Carmen wants to paint the ceiling of her restaurant. The ceiling is in the shape of a square. Its side lengths are 39 feet. Suppose each can of paint will cover 169 square feet. How many cans will she need to paint the ceiling?

There are 6 lollies in a packet A teacher buys 25 packets and divides them equally amping her students Each student gets 4 lollies and there are 22 lollies left over. How many students are there altogether?

How does the volume of a cone change if its radius and height are both tripled? A. B. C. D.

Compare - 6 broken bulbs out of 20 or 7 broken bulbs out of 30

What's y=7x+5, shifted 6 units down

Pencils come in packages of 8. Erasers come in packages of 7. Philip wants to purchase the smallest number of pencils and erasers so that he will have exactly 1 eraser per pencil. How many packages of pencils and erasers should Philip buy? A.

What is a triangle called when it has one right angle?

Decide whether the number is a solution of the equation Is 5 a solution of 4f=25-f

Graphing linear equation x=-4

If one triangle is congruent to another then all its sides and angles would be same?