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maxonik [38]
3 years ago
6

I will give brainliest to whoever helps me with this question. Also, if you could please explain to me how you solved it I would

appreciate it!

Mathematics
2 answers:
lesya [120]3 years ago
6 0

Answer:

20x3.14=62.8 62.8x10=628 Volume=628inches

Step-by-step explanation:

Plz give me brainlist

lina2011 [118]3 years ago
4 0

Answer:

3,140

Step-by-step explanation:

V=Bh

Pi(r^2)h

3.14 x 10^2 x 10

\ \

= 3.14 x 10 x 10 x 10

=3,140

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When an electric current passes through two resistors with resistance r1 and r2, connected in parallel, the combined resistance,
kondaur [170]

Answer:

a)

The combined resistance of a circuit consisting of two resistors in parallel is given by:

\frac{1}{R}=\frac{1}{r_1}+\frac{1}{r_2}

where

R is the combined resistance

r_1, r_2 are the two resistors

We can re-write the expression as follows:

\frac{1}{R}=\frac{r_1+r_2}{r_1r_2}

Or

R=\frac{r_1 r_2}{r_1+r_2}

In order to see if the function is increasing in r1, we calculate the derivative with respect to r1: if the derivative if > 0, then the function is increasing.

The derivative of R with respect to r1 is:

\frac{dR}{dr_1}=\frac{r_2(r_1+r_2)-1(r_1r_2)}{(r_1+r_2)^2}=\frac{r_2^2}{(r_1+r_2)^2}

We notice that the derivative is a fraction of two squared terms: therefore, both factors are positive, so the derivative is always positive, and this means that R is an increasing function of r1.

b)

To solve this part, we use again the expression for R written in part a:

R=\frac{r_1 r_2}{r_1+r_2}

We start by noticing that there is a limit on the allowed values for r1: in fact, r1 must be strictly positive,

r_1>0

So the interval of allowed values for r1 is

0

From part a), we also said that the function is increasing versus r1 over the whole domain. This means that if we consider a certain interval

a ≤ r1 ≤ b

The maximum of the function (R) will occur at the maximum value of r1 in this interval: so, at

r_1=b

6 0
3 years ago
What is the next number in the sequence 3,7,15,31,63,
andrew-mc [135]

Answer:

The next number is 127

Step-by-step explanation:

The sequence is the previous number times 2 plus one.

6 0
3 years ago
Pablo folds a straw into a triangle with side lengths of 4x2−3 inches, 4x2−2 inches, and 4x2−1 inches. Which expression can be u
Maksim231197 [3]

Answer:

A.12x2 −6; 21 inches

Step-by-step explanation:

3 0
2 years ago
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Solve for x.<br><br> 0.5x + 78.2 = 287
vladimir2022 [97]
0.5x + 78.2 = 287
          -78.2  -78.2

subtract 78.2 on both sides you will then get 0.5x = 208.8 you will then divide by 0.5 and the answer is x =  417.6
3 0
3 years ago
Read 2 more answers
Help and i will make brainliest and will than and rate and give points if someone helps me
Marysya12 [62]
1.
8{c}^{2} - 1.5d \\
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