In a certain year, a magnitude 7.6 earthquake struck California. In another year, a magnitude 5.6 earthquake struck North Dakota. How many times as intense as the North Dakota quake was the California quake?

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?

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle