Point J (-8,-12) is reflected across the x-axis. What are the coordinates of J'? Group of answer choices

(8,12)

(12,-8)

(-12,-8)

(-8,12)

(8,-12)

(12,8)

(-8,-12)

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Ответ:

marcgtz511p3pln7

29.01.2023

Mathematics

D. 18 bags

Step-by-step explanation:

Given:

Matilda is filling a circular section of her porch with colorful pebbles.

Diameter of circular section = 15 feet.

Each bag of pebbles covers 10 square feet.

Question asked:

How many bags of pebbles will Matilda need?

Solution:

Diameter of circular section = 15 feet

Radius, r = $\frac{Diameter}{2}=\frac{15}{2} =7.5\ feet$

$Area\ of\ circular\ section=\pi r^{2}$

$=\frac{22}{7} \times7.5\times7.5=\frac{1237.5}{7}=176.78} \ square\ feet$

10 square feet is covered by number of bag of pebbles = 1

1 square feet is covered by number of bag of pebbles = $\frac{1}{10}$

176.78 square feet is covered by number of bags of pebbles =

$\frac{1}{10}\times176.78=17.67$

We found up to 17 bags of pebbles there is still some place left to fill the section:-

Thus, Matilda need about 18 bags of pebbles to fill the circular section of her porch.

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Point J (-8,-12) is reflected across the x-axis. What are the coordinates of J'? Group of answer choices (8,12) (12,-8) (-12,-8) (-8,12) (8,-12) (12,8) (-8,-12)