Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer. [Start 4 By 4 Matrix 1st Row 1st Column negative 1 2nd Column negative 4 3rd Column 0 4st Column 1 2nd Row 1st Column 5 2nd Column 5 3rd Column 30 4st Column negative 5 3rd Row 1st Column negative 2 2nd Column negative 8 3rd Column 4 4st Column 2 4st Row 1st Column 0 2nd Column negative 1 3rd Column 2 4st Column 1 EndMatrix ]

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

about 0.75 hours

step-by-step explanation:

the area of a triangle is determined by the formula: base x height * 1/2

you'll need to assign a base to the triangle. based on the vertices given, the simplest base would be the line segment from (-2,1) to (2,1). the distance between any two numbers is found by just subtracting them. here, you should subtract the x values to find the distance of this side.

2 - (-2) = 4.

so the distance (aka the length of the base) is 4. the height of the triangle is the distance between the base and the highest point on the triangle which is (3,4). we should subtract the y values this time to find the height/distance.

4 - 1 = 3

so the height is 3.

base = 4

height = 3

hope this if needed hmu

y-y1=m(x-x1)

y-1=1(x-8)