Which statement is true about the function f(x) = -√x?
a. it has the same domain and range as the function f(x) = √x.
b. it has the same range but not the same domain as the function f(x) = √x.
c. it has the same domain and range as the function f(x) = -√-x.
d. it has the same range but not the same domain as the function f(x) = -√-x.

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)

The trigonometric ratios sine and secant are reciprocals of each other

How is working backward similar to solving an equation?