Suppose the depth of the tide in a certain harbor can be modeled by y = 23 - 5 cos pi/6 t, where y is the water depth in feet and t is the time in hours. Consider a day in which t = 0 represents 12:00 midnight. For that day, when are high tide and low tide and what is the depth of each? a.
high tide at 6:00 a. m. and 6:00 p. m., depth 28 ft
low tide at 12:00 noon and 12:00 midnight, depth 18 ft
b.
high tide at 6:00 a. m. and 6:00 p. m., depth 23 ft
low tide at 12:00 noon and 12:00 midnight, depth 5 ft
c.
high tide at 12:00 noon and 12:00 midnight, depth 28 ft
low tide at 6:00 a. m. and 6:00 p. m., depth 18 ft
d.
high tide at 12:00 noon, depth 23 ft
low tide at 6:00 a. m., depth 5 ft

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.

Stacey filled her 1/2 cup of measuring cup seven times to have enough flour for a cake recipe how much flour does the cake recipe calls for

On average a herd of elephants travels 10 miles in 12 hours you can use that information to answer different questions drag each expression to show which is answers