sally and Martha had the same number of postcards after Sally sold 18 of her postcards Martha had four times as many postcards as Sally how many postcards did each girl have to begin with

How to solve this math equation - 9x ≥-90

What are the Y-intercepts of these problems: * y=3x+2 * 5x-3y=12

Danna takes 4 breaths per 10 seconds during yoga. At this rate, about how many breaths would danna take in 2 minutes of yoga?

Josh paid for three books with two 20$ bills he received 1$ in change. Each book was the same price how much did each book cost

A stereo is marked down $75. If this is a 15% decrease find the sale price. How do you work this problem out?

Polygon ABCDE and polygon FGHIJ are similar. The area of polygon ABCDE is 80. What is the area of FGHIJ?

The queen received a diamond brooch for her birthday. The largest gem weighed 5.1 carats. There were three other gems that weighed 0.7 carats, 1.4 carat, and 2.6 carats. What was the total weight of the gems?

Ramon earns $1,825 each month and pays $53.20 on electricity. To the nearest tenth of a percent, what percent of Ramon's earnings are spent on electricity each month?

Which is the answer for-18 + 12 + - 27 + - 9 + 16

Solve this equation 4 (2) - 3 = 2 (2) + 9