For the function y = -1 + 6 cos(2π/7(x-5)), what is the minimum value

The trigonometric ratios sine and secant are reciprocals of each other

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- 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. 3- 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 part b?