Here a subtraction problem that has been solved incorrectly 21-9=11 what answer I got b 11+9=20

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?

Hurrya vegetable garden and a surrounding path are shaped like a square that together are 11ft wide. the path is 2ft wide if one bag of gravel covers 9 square feet how many bags are needed to cover the path