Solve the problems below. Be sure to sho 15. Erin weighs 135 pounds and is gain pound each week. Which of the follow that it will take until the two girls weig A. \( 135+\frac{1}{2} x=143+\frac{1}{2} \) B. B. \( 135+\frac{1}{2} x=143 \)

Find dif \( a_{1}=-17 \) and \( a_{13}=-29 \)

Use the elimination method to find all solutions of the system: \( \left\{\begin{array}{l}x^{2}-2 y=7 \\ x^{2}+5 y=14\end{array}\right. \) The two solutions of the system are: (the one with \( x<0 \) is) \( x=\square \) \( y=\square \) (the one with \( x>0 \) is) \( x=\square \) \( y=\square \)

Solve the system if possible by using Cramer's rule. If Cramer's rule does not apply, solve the system by using another meth Write all numbers as integers or simplified fractions. \[ \begin{array}{l}7 x+7 y=-19 \\ \\ -9 x-5 y=4 \\ \text { Part: } 0 / 2 \\ \text { Part } 1 \text { of } 2 \\ \text { Evaluate the determinants } D_{1} D_{x} \text {, and } D_{y} \\ D=\square\end{array} \] \( \square \)

14. Uttrycken nedan har samma positiva värde på \( a \). Vilka tal ska stå i rutorna så att likheterna stämmer? \( a^{\frac{1}{3}}=\square \quad a^{\frac{2}{3}}=9 \)

\( \frac { 3 ) } { 3 x + 4 } = \frac { 2 x - 8 } { 3 } \)