Explain the meaning of the statement ""arcsin1 /2=30°."" draw a diagram to support your explanation.

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?