3.33 points Choose the best answer based on the information provided. Words can only be used once. Positive ion. Proof that a gas is being released. A solid substance that forms and separates from a solution that may indicate that a chemical reaction may have occurred. Negative ion.

8.1 Die waarde van ' \( n \) droogskoonmaakmasjien met ' \( n \) beginwaarde van R295 000, verminder teen \( r \% \) p.j. met die verminderde saldo metode. Na vyf jaar is die masjien se waarde R130 000. Beteken die koers \( r \) waarteen die masjien se waarde afneem.

For Questions 5-7, find the percent of time spent each day (based on a 24-hour day) on the activity listed. Find to the nearest whole percen 5. Sleep: 7.0 hours. A. \( 29 \% \) B. \( 31 \% \) C. \( 33 \% \) D. \( 26 \% \)

Use Gauss-Jordan elimination to find the solution to the following system: \( x-y+2 z+w=3 \) \( 2 x-2 y+2 w=1 \) \( -x+3 y+w=1 \) A) \( x=5 / 4, y=3 / 4, z=5 / 4, w=0 \) B) \( x=5 / 4-2 w, y=3 / 4-w, z=5 / 4, w= \) arbitrary C) There is no solution D) None of the above

7. Find the amount of sales if the rate of commission is \( 3.5 \% \) and the amount of commission is \( \$ 420 \). A. \( \$ 120 \) B. \( \$ 1,200 \) O. \( \$ 1,470 \) D. \( \$ 12,000 \)

Withour using a calculator or mathematical tables, evaluate \( 49^{\frac{3}{2}} \times\left(\frac{256}{2401}\right)^{\frac{3}{4}} \)