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olya-2409 [2.1K]

3 years ago

5

Need help asap please!!!

2 answers:

Kay [80]3 years ago

7 0

Answer:

C

Step-by-step explanation:

Its because to find the amount of money you need for __ amount of boxes, you must multiply. So, the correct answer is c = 66.12n which also means c = 66.12 x n.

antiseptic1488 [7]3 years ago

6 0

Answer:

C

Step-by-step explanation:

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Combine like terms to create an equivalent expression.<br> -5.8c+4.2-3.1+1.4c−5.8c+4.2−3.1+1.4c

nordsb [41]

Answer:

Step-by-step explanation:

-11.6+8.4-15.5+2.8

8 0

3 years ago

Read 2 more answers

Use the substitution of x=e^{t} to transform the given Cauchy-Euler differential equation to a differential equation with consta

kherson [118]

By the chain rule,

$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{\mathrm dy}{\mathrm dt}\dfrac{\mathrm dt}{\mathrm dx}\implies\dfrac{\mathrm dy}{\mathrm dt}=x\dfrac{\mathrm dy}{\mathrm dx}$

which follows from $x=e^t\implies t=\ln x\implies\dfrac{\mathrm dt}{\mathrm dx}=\dfrac1x$ .

$\dfrac{\mathrm dy}{\mathrm dt}$ is then a function of $x$ ; denote this function by $f(x)$ . Then by the product rule,

$\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm d}{\mathrm dx}\left[\dfrac1x\dfrac{\mathrm dy}{\mathrm dt}\right]=-\dfrac1{x^2}\dfrac{\mathrm dy}{\mathrm dt}+\dfrac1x\dfrac{\mathrm df}{\mathrm dx}$

and by the chain rule,

$\dfrac{\mathrm df}{\mathrm dx}=\dfrac{\mathrm df}{\mathrm dt}\dfrac{\mathrm dt}{\mathrm dx}=\dfrac1x\dfrac{\mathrm d^2y}{\mathrm dt^2}$

so that

$\dfrac{\mathrm d^2y}{\mathrm dt^2}-\dfrac{\mathrm dy}{\mathrm dt}=x^2\dfrac{\mathrm d^2y}{\mathrm dx^2}$

Then the ODE in terms of $t$ is

$\dfrac{\mathrm d^2y}{\mathrm dt^2}+8\dfrac{\mathrm dy}{\mathrm dt}-20y=0$

The characteristic equation

$r^2+8r-20=(r+10)(r-2)=0$

has two roots at $r=-10$ and $r=2$ , so the characteristic solution is

$y_c(t)=C_1e^{-10t}+C_2e^{2t}$

Solving in terms of $x$ gives

$y_c(x)=C_1e^{-10\ln x}+C_2e^{2\ln x}\implies\boxed{y_c(x)=C_1x^{-10}+C_2x^2}$

4 0

3 years ago

Help me the picture is below..........................................

qwelly [4]

Answer:

= $(\frac{5}{13}t+\frac{1}{13}t)+(-12+15) = \frac{6}{13}t +3$

<u />

<u>Explanation</u>

Separate the values with the variables and add them together, the same case for those without the variables.

7 0

3 years ago

A star track runner ran 315 feet in nine seconds. What was his average speed in feet per second?

Burka [1]

315 / 9 = 35
35 feet per second

3 0

3 years ago

A box contains 6 red and 8 green marbles. You reach in and remove 3 marbles all at once.

bonufazy [111]

Answer: $\frac{5}{91},\frac{38}{182}$

Step-by-step explanation:

(a)Probability that these three marbles are all red

choosing 3 red out of 6 is given by $^6C_3$

and choosing 3 marble from 14 marbles= $^{14}C_3$

$Probability=\frac{^6C_3}{^{14}C_3}=\frac{5}{91}$

(b)All of same color

It is possible when they are of either red or green

For red it is $\frac{^6C_3}{^{14}C_3}$

For Green it is

$\frac{^8C_3}{^{14}C_3}$

total= $\frac{^6C_3}{^{14}C_3}+\frac{^6C_3}{^{14}C_3}$

= $\frac{38}{182}$

7 0

3 years ago