How do you prove adjacent sides are perpendicular?

Randy makes two slices through a three-dimensional object. One plane is parallel to the base; the other plane is perpendicular to the base. The two cross-sections are the same size and shape. What three dimensional shapes Might randy have cut

A sailboat and a power boat leave from the same marina at the same time. The sailboat travels at 7 km/h, 14? west of south. The power boat travels at 19 km/h, 22? east of south. They travel for 6 h on the same course and stop.

How do you round 30,361 to the nearest dollar

Which product is negative? (a) 6 • (-2) • (-3) • 1 (b) - 3 • (-4) • (9) • 0 (c) - 7 • (3) • (5) • (8) (d) - 2 • (-4) • 8 • (-1)

7h - 5 (3h - 8) = - 72

3x-2y+4z=35 -4x+y-5z=-36 5x-3y+3z=31

Steve earns $8 per hour. His older brother earns $2 more per hour than Steve. What is the ratio of the money Steve earns in an hour to the money his brother earns in an hour?

10. 0.75,1/2, 0.4, and 1/5 from least to greatest

Greg is running a marathon while running he should drink 22 ounces of water per hour if he runs for 4 hours how much water should he drink

Measure of two angles is 80 degrees and 55 degrees. Are these supplementary angles?