Answer:
25 is greater than -4(-4) because -4(-4) is 16, which is less than 25.
5,382,619 rounded to the nearest thousand is 5,383,000.
The area of the trapezoid is 88 cm^2.
To do this problem, first draw out the picture. Then, you will see that the legs of the triangle form a 6, 8, 10 Pythagorean Triple triangle. That gives us the height of the trapezoid as 8.
To find the area of the trapezoid, we can use the equation:
A = 0.5(8)(5 + 17)
A = 88 cm^2
To use mental math think instead of 81 to 80 and 16 to 10 and subtract that and add the other numbers and subtract that and you will have your answer presto!