Find the sum:
413+11 12
0 15 15
0 1513
0263
48-15

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1