The row-echelon form of the augmented matrix of a system of equations is given. Find the solution of the system.
1 0 -1 -3
0 1 5 -4
0 0 1 1

A. x = -3
y = -9
z = 1

B. x = 2
y = -9
z = 1

C. x = -2
y = -9
z = 1

D. x = 3
y = -9
z = 1

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.