What is the reciprocal of each number?

column a column b
1. 2/9

2. -9/2

3. 9/2

4. -2/9

a. -9/2

b. -2/9

c. 2/9

d. 9/2

e. 1

What is the value of the expression below? (81^2)^1/8

Solve the problem. a student earned grades of c, a, b, and a in four different courses. those courses had these corresponding numbers of credit hours: 4, 5, 1, and 5. the grading system assigns quality points to letter grades as follows: a = 4, b = 3, c = 2, d = 1, and f = 0. compute the grade point average (gpa) and round the result to two decimal places. 3.40 3.50 8.75 2.18

Hormones perform important functions within the reproductive system. during puberty, a number of changes occur in the body. which hormone is responsible for the development of these characteristics in the female? estrogen progestin progesterone testosterone