Solve the system of equations using matrices. Use Gaussian-Jordan elimination.

6) 7x - y + 2z = 21

9x - 3z = 0

3y + z = 21

Rosa & her friends are eating out for dinner. The bill was $45.80. They want to leave a 20% tip. How much should they leave for a tip.

What is one half of 5/8

What is decimal for 2 7/10

For which values of p and q does the following equation have infinitely many solutions Px + Q = 46x + 23

Tommy earned $20 per lawn $9 per pool he needs $1500 to buy car. If tommy plans to mow 41 lawns how many pools must he clean to earn at least $1500

Solve for x and y. 2y-7x=-9 and 4x+6=y

Which of the following is not equivalent to - 2/3? 5/6 - 18/12 -3/8•2 -2/6 + 1/3 5/10*-15/20

Write 12345678 times 10^-9 as a decimal.

What does d + 2d + d =

Which inequality represents this sentence? Six plus two is less than nine plus three. 6+2>9+3 9+3<6+2 6+2≤9+3 6+2<9+3 Which values of s are solutions to the inequality? s>-10 Select each correct answer. s=-2 s=-8 s=-18 s=-108 s=-180