21. Water drains from a pool at a rate of 3 cm per minute. If the original depth of the water in the pool is 150 cm , how long will it take the water in the pool to be only 90 cm deep? (Lesson 8 -6)

\( \mathrm{Zn}(\mathrm{OH})_{2} \), absorbent Spell out the full name of the compound.

Let \( f(x)=x-2 \) and \( g(x)=x+1 \). Find each of the following. \( \begin{array}{lll}\text { a. }(f g)(x) & \text { b. }(f g)(-2) & \text { c. }(f g)(0)\end{array} \) \( \begin{array}{l}\text { a. }(\mathrm{fg})(x)=\square\end{array} \)

ich \( \begin{array}{l}\text { 2. The cost of attending a private university is } \\ \$ 38,000 \text { for the first year. } \\ \text { - A student's uncle will pay half of this cost. } \\ \$ 10.000 \text {. }\end{array} \) Which amount is closest to the minimum that the student will need to save every month in order pay off the remaining cost at the end of 2 years? A. \( \$ 791.67 \) B. \( \$ 750.00 \) C. \( \$ 450.00 \) D. \( \$ 375.00 \)

For the numbers below, find the percent between the mean and the \( z \)-scor a) \( z=1.17 \) b) \( z=-1.37 \)

If \( a \) and \( b \) are integers then \( a \) divides \( b \) if there exists an integer \( c \) such that \( a=b c \). \( a=b c \) for some integer \( c \). \( b=a c \) for some itteger \( c \). there exists an integer \( c \) such that \( b=a c \).