Find each sum or difference

36.12+5.793

Ytterbium decays 50% every 4.2 days. How much of an 80g sample would be left after 54.6 days?

The number of gallons of gas that were in the tank plus 73 more adds up to 16 gallons

David & Brad are competing in a 20-mile bicycle race. David rides 6.2 miles in 1/4 hour. Brad rides 11.9 miles in 1/2 hour. If both riders continue at the same average speed, who will finish first? Explain how you know

Without solving the equation, determine the nature of the roots of 2x2 + 3x + 9 = 0. Two, real unequal roots Two, real equal roots No real roots

4/7 + 1/3 = Write the answer in simplest form.

6x + 4x - 1 = 2 (5x+4)

Round to 2 decimal places 54.983

One fourth of a solution that was 10 percent sugar by weight was replaced by a second solution resulting in a solution that was 16 percent sugar by weight. The second solution was what percent sugar by weight?

Mini muffins cost $3 per dozen Andre says "I have $2 so I can afford 8 muffins" Elena says "I want to get 16 muffins so I'll need to pay $4 Do you agree with either, both, or neither of them?

A slide 4.1 meters long makes an angle of 35º with the ground. To the nearest tenth of a meter, how far above the ground is the top of the slide?.