Write a $*C++$ application that $*$ will $*$ declare $*$ the $*$ following $*$ variables $,$ and $*z$ with $*$ initial $*$ values of $10\mathrm{.}0$ and will execute the following formulas. "All variables are to be doubleprecision floating point $*$ numbers.

$a=3x+y$

$b=\frac{x+y}{7}$

$c=\frac{3x+y}{z+2}$

Check the results to verify that your program $\text{'}$is coded correctly.