Solve the system of equations using matrices. use gaussian elimination with back-substitution.    x + y + z      =      -5  x - y + 3z     =     -1  4x + y + z    =     -2 

Acompany wants to reduce the dimensions of its logo by one fourth to use on business cards. if the area of the original logo is 4 square inches, what is the area of the logo that will be used on the business cards?

Which of the following is the true for f(x) = 5cos

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how