What is 399 rounded to the nearest ten

You and a friend race across a field to a fence and back. your friend has a 50-meter head start. the equations shown represent you and your friend's distances dd (in meters) from the fence tt seconds after the race begins. find the time at which you catch up to your friend. you: d=∣−5t+100∣d=∣−5t+100∣ your friend: d=∣−313t+50∣∣

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.