Please answer this. Thank you!

8: 73.2

10: 738

Step-by-step explanation:

Area of a trapezoid =

where a and b = base lengths and h = height

For #8

These are the given dimensions

Base 1 = 4.5

Base 2 = 7.5

Height = 12.2

All we have to do is plug in the values into the formula

So....

Hence the answer is 73.2cm²

For #10

Once again all we have to do is plug in the values into the formula

Hence the answer is 738

it has 4

step-by-step explanation:

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option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,