19 - 19 + 11 - 10 + 2 Pleeeeeeease help
2 answers:
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Answer:
The correct are is 5.5 cm².
Step-by-step explanation:
First of all, Carlos calciulated the are of the rectangle correctly, only the are unit is wrong, it should be 3 cm².
He made a mistake calculating the area of a the triangle: The area of a triangle can be calculated by multiplying the base by the height by .
(Comment if you want a deeper explanation on where this comes from)
He mistakenly takes 4 cm for the height, but if you look carefully the height of the triangle in this case is 4 cm - 1.5 cm = 2.5 cm.
That gives for the area of the triangle.
Adding those two together gets you a total area of 5.5 cm².
Use this property,
![\sqrt[b]{x^{a} } = x ^{ \frac{a}{b} }](https://tex.z-dn.net/?f=%20%5Csqrt%5Bb%5D%7Bx%5E%7Ba%7D%20%7D%20%20%3D%20x%20%5E%7B%20%5Cfrac%7Ba%7D%7Bb%7D%20%7D%20)
In the given question, a = x and b = 4
![80 ^{ \frac{x}{4} } = \sqrt[4]{80^{x} }](https://tex.z-dn.net/?f=80%20%5E%7B%20%5Cfrac%7Bx%7D%7B4%7D%20%7D%20%3D%20%20%20%20%5Csqrt%5B4%5D%7B80%5E%7Bx%7D%20%7D%20%20)
∴ 2nd one is correct
In the given question, a = x and b = 4
∴ 2nd one is correct