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3 years ago

Please help!! will mark brainliest.

Mathematics

1 answer:

Phoenix [80]3 years ago

6 0

Answer: 455+124=587

Step-by-step explanation:

12+36(45x+3)

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Consider the proof.

fiasKO [112]

Answer:

Correct choice is B

Step-by-step explanation:

In step 4 were proved that $\triangle ABC\sim\triangle DEC.$

By definition, similar triangles have proportional lengths of corresponding sides. To the side AB corresponds side ED, to the side AC corresponds side DC and to the side BC corresponds side EC. Thus,

$\dfrac{AC}{DC}=\dfrac{BC}{EC}.$

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3 years ago

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Which statement(s) about the line below are true? Select all that apply.

Dafna11 [192]

(0,4) the y intercept is 4
The slope is traveling upwards
Given that:
Answer: B and C

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Hayden's checking account balance was $145.95. After two checks were cashed, each for the

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Answer: A. Amount of each cashed check.

Step-by-step explanation:

145.95 - 2x = -4.05

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X=75

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3 years ago

camilla earned a grade of 80% on a math test that has 20 problems. how many problems on this test did the student answered corre

notsponge [240]

Answer:

16 questions

Step-by-step explanation:

80% of 100 is 80, so we take that and divide it by 5 and we get 16.

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As a spherical raindrop falls, it reaches a layer of dry air and begins to evaporate at a rate that is proportional to its surfa

Soloha48 [4]

Answer:

Option A)

$\dfrac{dV}{dt} = k(4\pi r^2)$

Step-by-step explanation:

We are given the following in the question:

The rate of evaporation of rainfall drop is proportional to surface area.

Volume of rainfall drop =

$\text{Volume of sphere} = V = \displaystyle\frac{4}{3}\pi r^3$

Surface area of rainfall drop =

$\text{Surface area of sphere} = S =4\pi r^2$

$\displaystyle\frac{dV}{dt} \propto 4\pi r^2\\\\\frac{dV}{dt} = k(4\pi r^2)\\\\\text{k is a constant of proportionality}$

Now,

Rate of evaporation =

$\displaystyle\frac{dV}{dt} = \frac{d}{dt}(\frac{4}{3}\pi r^3) = 4\pi r^2\frac{dr}{dt}$

Equating the two values we get,

$k(4\pi r^2) = 4\pi r^2\displaystyle\frac{dr}{dt}\\\\\frac{dr}{dt} = k$

Thus, the radius radius of the raindrop decreases at a constant rate. Because the evaporation is proportional to,

Option A)

$\dfrac{dV}{dt} = k(4\pi r^2)$

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3 years ago