The sum of 3a²-a-3 and 2a-9 is 3a²+a-12
3a²+a-12 - (a²-3a-7) = 3a²+a-12 - a² + 3a + 7 =
2a² +4a - 5
Answer:
127 square ft
Explanation:
The formula to find the area of a circle with a know circumference is: C^2/4 π.
40^2 is 1600 and 4 times pi is 12.56. Divide 1600 by the 12.56 and you will get your area of 127.39. The answer is 127 square ft after rounding to the nearest square foot.
Alternate interior angles.
Explanation
When two angles lie on same line but on different sides, then it's Alternate interior angles.
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Complementary angles: two angles that add to 90°
Supplementary angles: two angles that add to 180° (x)
angle "y" : y= 5x+6
180= (5x+6) + x
180=6x+ 6
174=6x
x=29
180- 29= 151
Answer: 151°
