What is value of A=sin -1(2/10 rounded to three decimal places

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Find an equation for the linear function which has slope -10 and x-intercept -7

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?