1. The diameter of a sphere is \( 30 \) centimeters. Which of the following is closest to the surface area of the sphere?
A. \( 377 \) square centimeters
B. \( 2,827 \) square centimeters
C. \( 11,310 \) square centimeters
D. \( 45,239 \) square centimeters
B
How long will it take \(\$ 1500\) to double itself at \(6 \%\) sim- ple interest?
A pharmacist makes eye drops with saline solution. A \(10 \%\) saline solution mixed with an \(80 \%\) saline solution makes \(7\) cups of a \(60 \%\) saline solution. How many cups of the \(80 \%\) solution should be used?
