Convert the following systems into a matrix. 2x – 3y + 7z = 8
x + y - z = 0
-5x + 3y - 5z = 10
PLEASE HELPPP

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?