3 years ago

Consider the line y=- 2x+7.

Mathematics

2 answers:

OleMash [197]3 years ago

6 0

Answer:

Step-by-step explanation:

The slope of a perpendicular line is 1/2

The slope of a parallel line is -2

iVinArrow [24]3 years ago

3 0

Answer:

the slope is rhe same -2

Step-by-step explanation:

the slope is the opposite +1/2

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The volume of a sphere is 28/3 times it surface area, find the surface area

pentagon [3]

Answer:

615.44 units squared

Step-by-step explanation:

Let the volume and surface area of the sphere be V and S respectively.

$\therefore V = \frac{28}{3} \times S\\\\\therefore \frac{4}{3} \pi {r}^{3} = \frac{28}{3} \pi {r}^{2} \\ \\ \frac{ {r}^{3} }{ {r}^{2} } = \frac{28\pi}{3} \times \frac{3}{4\pi} \\ \\ r = 7 \: units \\ \\ \because S = 4\pi {r}^{2} \\ \\ \therefore \: S = 4 \times 3.14 \times {7}^{2} \\ \\ \therefore \: S = 12.56 \times 49 \\ \\ \therefore \: S =615.44 \: {units}^{2}$