3 years ago

Simplify the expression: 9r + -5r + 7 - 4 + -2r + -4

Mathematics

2 answers:

olga nikolaevna [1]3 years ago

7 0

Answer:

2r-1

I would appreciate if my answer is chosen as a brainliest answer

Amiraneli [1.4K]3 years ago

4 0

The photo has an answer for you

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4. Using the formula for the volume of a cylinder, , find h when V = 141.3 and r = 3. Use pi = 3.14.

olya-2409 [2.1K]

$\text{The formula of a volume of a cylinder}\\\\V=\pi r^2h\\\\\text{We have}\ V=141.3\ \text{and}\ r=3.\ \text{Substitute}\\\\\pi(3^2)h=141.3\\\\9\pi h=141.3\qquad|\text{divide both sides by}\ 9\pi\\\\h=\dfrac{141.3}{9\pi}\qquad|\text{use}\ \pi\approx3.14\\\\h=\dfrac{141.3}{9\cdot3.14}\\\\h=\dfrac{141.3}{28.26}\\\\\boxed{h=5}$

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