If a+b+c=7 and ab+bc+ca=20 find the value of a^2+b^2+c^2

A first-class postage stamp was $0.02 in 1885. The same first-class postage stamp in 2006 was 39¢. What is the percent of increase in the cost of a first-class postage stamp?

The larger square has area of 400 square inches. the areas of the two squares have a ratio of 1:4. what is the side lengh of the smaller square?

Tina's salsa class membership, which is $15, is deducted automatically from her bank account every month. Which expression shows the total deductions for the year?

45:100:20 in simplest form

F (n+1) = -0.5f (n) of the first term in the sequence is 120 what is f (5) ?

Solve y=-x+2 and y=-2x-1 as a graph, substitution, or elimination?

Complete rate table for spaghetti ingredients 12 ounces of spaghetti sauce need 16 ounces of tomato's what does 1 oz sauce equal to tomatoes

Find the height of a triangle with an area (a) of 35 square inches and base (b) of 7 inches. Use the formula for the area of a triangle, a = 1/2bh

A survey of 50 people found that 14 people like building a snowman. If 600 people had responded, how many would have been expected to list building a snowman as their favorite winter activity? theoretical or experimental probability, and why

What is leaner equation