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IgorLugansk [536]
2 years ago
6

What is the value of z so that -9 and 9 are both solutions of x^2+z=103?

Mathematics
1 answer:
Ira Lisetskai [31]2 years ago
8 0
The answer is C.
x^2 + z = 103x^2 + 22 = 103*Subtract both sides by 22*x^2 + 22 - 22 = 103 - 22x^2 = 81*square root both sides to find x*√x^2 = <span>√81</span>
<span>x = +- 9</span>
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Classwork 12.1 surface area
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Answer:

6) LA = 90 units² and SA = 202 units²

7) LA = 377 units² and SA = 477.5 units²

8) LA = 208 units² and SA = 232 units²

9) LA = 455 units² and SA = 591 units²

Step-by-step explanation:

* Lets revise the rules of lateral area and surface area

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- Its height is 3 units

∵ Perimeter of the rectangle = 2(L + W)

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7) The solid is a cylinder

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6) The solid is a triangular prism

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∴ Perimeter of the base = 5 + 5 + 6 = 16 units

∴ LA = 16 × 13 = 208 units²

∵ Area of the triangle = 1/2 × base × height

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