20% of what number is 90?

A shopper paid $51.93 including tax for an item marked $48.99. What would she pay for another item marked $75? Find the tax rate OAC/OA, round to the nearest whole percent, then use it to find the tax on $75.

A triangular courtyard has a perimeter of 120 meters. The lengths of two sides are 30 meters and 50 meters. How long is the third side?

Find the decimal form of 2/4

Why are significant figures not important when solving problems in your math class

The diameter of the circle above is 20 cm. What is the circumference of the circle? (Use = 3.14.) A. 628 cm B. 314 cm C. 62.8 cm D. 31.4 cm

Let a, b, c be the lengths of sides of a triangle; a=4.8, b=0.23, and c is a whole number. Find c.

Tell whether the graphs of the two equations are parallel lines ... (24) y = 8x-3, 8x + y = 3 (25) 2x + y = 5, - 6 + 2x = y (26) 2x + y = 5, y = 0.5x - 3 (27) y = - 0.6 + 2, 5y + 3x = 8 (28) 8x + 3y = 9, 3y - 4 = 8x (29) 10x + 2y = 7, 5x - y = 6

In multiplication, if one term is negative and one term is positive, the result will always be?

Write the inverse of y=pi/2 + sin x

Solve the following problem which includes scientific numbers. Show answer in scientific notation. (1.49 * 10-2) * (2.3 * 10-3) =