Write the given system as a matrix equation and solve by using the inverse coefficient matrix. Use a graphing utility to perform the necessary calculations. 12x1+ 20x2+ 25x3= 39
-23x1+ 24x2+12x3= 39
7x1+x2+7x3=-29

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

college

what is the answer?

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.