Solve the following system of equations by the elimination method. Check the solution(s). \( \left\{\begin{array}{l}3 x+4 y=5 \\ 6 x+8 y=10\end{array}\right. \) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. There is one solution. The solution set is \( \left\{\begin{array}{l}\text { B. The system is dependent. The solution set is the set of all ordered pairs }\{(x, \square)\}, \text { where } x \text { is any real number. } \\ \text { (Simplify your answer. Type an ordered pair, using integers or fractions.) } \\ \text { (Simplify your answer. Type an expression using } x \text { as the variable. Use integers or fractions for any numbers in the expression.) } \\ \text { C. The system is inconsistent. }\end{array}\right. \).

42. Julio paid \( 7 \frac{3}{4} \% \) sales tax on an item he bought. He figured that if he had bought the item in a neighboring state where the sales tax is \( 8 \frac{1}{4} \% \), he would have paid \( \$ 75 \) more. What was the cost of the item before tax? (C) \( \$ 15,000.00 \) (IS) \( \$ 3,750.00 \) (C) \( \$ 1,500.00 \) (D) \( \$ 150.00 \) (F) \( \$ 37.50 \)

Exercice N1 \( \begin{array}{lll}\text { Simplifier les expressions suivantes puis calculer leur valeur: } \\ \begin{array}{lll}\text { 1. } a=5^{1,7} \times 5^{1,3} & \text { 2. } b=\left(2^{-\frac{1}{5}}\right)^{6} & \text { 3. } c=4^{-0,7} \times \times \frac{1}{4^{0,3}}\end{array} & \text { 4. } d=\frac{6^{4,5} \times 6^{2,3}}{\left(6^{1,6}\right)^{3}}\end{array} \)

expunencial \( \left.\left(4^{2}\right)\left(2^{3}\right)^{2 x-5}\right)=8 \)

3.18. Determine el máximo comun divisor de los enteros \( 15,18,24 \) y escríbalo como una combinación lineal de \( 15,18,24 \). 3.19. Sea \( a \in \mathbb{Z}^{+} \)tal que \( \operatorname{mcd}(240, a)=1 \), probar que \( 240 \mid a^{4}-1 \).

Find \( n \), \( 3 n-6=18 n^{2} \) A) 0.654 (B) -0.488 (C) 0.654 OR -0.488 (D) No real roots