Use Gaussian elimination to find the complete solution to the following system of equations, or show that none exists. \( \left\{\begin{aligned}-x+y+z=-1 \\ -x+5 y-15 z=-13 \\ 3 x-2 y-7 z=\end{aligned}\right. \) Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. A. There is one solution. The solution set is \( \{(\square, \square)\} \) (Simplify your answers.) B. There are infinitely many solutions. The solution set is \( \{(\square, \square, z)\} \), where \( z \) is any real number. (Type expressions using \( z \) as the variable. Use integers or fractions for any numbers in the expressions.) C. There is no solution. The solution set is \( \varnothing \).

Answer Question 7 (4 points) Saved The force exerted by the wind on a plane surface varies jointly with the square of the velocity of the wind and with the area of the plane surface. If the area of the surface is 39 square feet surface and the wind velocity is 15 miles per hour, the resulting force is 16 pounds. Find the force on a surface of 69 square feet with a velocity of 33 miles per hour. (round off your answer to 2 decimal places) Your Answer: 137.65

Write the expression as a single logarithm. \[ \frac{1}{3} \log _{b} x+5 \log _{b} z-\log _{b} y \] \( \log _{\square}(\mathbb{)} \)

Question 7 ( 4 points) The force exerted by the wind on a plane surface varies jointly with the square of the velocity of the wind and with the area of the plane surface. If the area of the surface is 39 square feet surface and the wind velocity is 15 miles per hour, the resulting force is 16 pounds. Find the force on a surface of 69 square feet with a velocity of 33 miles per hour. (round off your answer to 2 decimal places) Your Answer: Answer

Write the expression as a single logarithm. \[ 2\left(\log _{2} w-4 \log _{2} z\right)+2 \log _{2} y \] \( \log _{\square}(\square) \)

Use long division to divide. (Simplify your answer completely.) \[ \left(2 x^{3}-11 x^{2}-19 x+3\right) \div(2 x+3) \] ,\( \quad x \neq-\frac{3}{2} \)