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2 years ago

What is the value of 7x2 + 2x when x = 3

Mathematics

2 answers:

telo118 [61]2 years ago

6 0

7x2+2x
7(3)2+2(3)
7(9)+6
63+6
69 so the answer is 69

Sophie [7]2 years ago

3 0

Answer:

The answer is 20

Step-by-step explanation:

2x=6 and then 7x2=14 then 14+6=20

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What is the approximate circumference of the circle ? use pi= 3.14.

Law Incorporation [45]

C=2pir
pi=3.14
r=18

c=(2)(3.14)(18)
c=(6.28)(18)
c=113.04

D is answer

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3 years ago

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2 years ago

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Bonnie deposits $70.00 into a new savings account. The account earns 45 % simple interest per year , s added or removed from the

nordsb [41]

Answer:

$\$164.5$

Step-by-step explanation:

Bonnie deposits $70.00 into a new savings account.

The account earns 45% simple interest per year.

She neither added or removed from the savings account for 3 years.

We know that,

$i=\dfrac{P\cdot r\cdot r}{100}$

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t = time = 3 years,

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$=\text{Principal}+\text{Interest}$

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3 years ago

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Consider the differential equation <img src="https://tex.z-dn.net/?f=%20x%5E%7B2%7D%20%20%5Cfrac%7Bdy%7D%7Bdx%7D%20%3D6%20y%5E%7

Nutka1998 [239]

As a Bernoulli equation:

$x^2\dfrac{\mathrm dy}{\mathrm dx}=6y^2+6xy\iff x^2y^{-2}\dfrac{\mathrm dy}{\mathrm dx}-6xy^{-1}=6$

Let $z=y^{-1}\implies\dfrac{\mathrm dz}{\mathrm dx}=-y^{-2}\dfrac{\mathrm dy}{\mathrm dx}$ . The ODE becomes

$-x^2\dfrac{\mathrm dz}{\mathrm dx}-6xz=6$
$x^6\dfrac{\mathrm dz}{\mathrm dx}+6x^5z=-6x^4$
$\dfrac{\mathrm d}{\mathrm dx}[x^6z]=-6x^4$
$x^6z=-6\displaystyle\int x^4\,\mathrm dx$
$x^6z=-\dfrac65x^5+C$
$z=-\dfrac6{5x}+\dfrac C{x^6}$
$y^{-1}=-\dfrac6{5x}+\dfrac C{x^6}$
$y=\dfrac1{\frac C{x^6}-\frac6{5x}}$
$y=\dfrac{5x^6}{C-6x^5}$

With $y(3)=6$ , we get

$6=\dfrac{5(3)^6}{C-6(3)^5}\implies C=\dfrac{4131}2$

so the solution is

$y=\dfrac{5x^6}{\frac{4131}2-6x^5}=\dfrac{10x^6}{4131-12x^5}$

which is valid as long as the denominator is not zero, which is the case for all $x\neq\sqrt[5]{\dfrac{4131}{12}}$ .

8 0

2 years ago

1/3 + 3/2 + 4/3 + 1/2 + 1/6

julia-pushkina [17]

Answer:0.407

Step-by-step explanation:

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2 years ago