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3 years ago

JoAnn works in a publicity office at the state university. She is paid

Mathematics

2 answers:

iren2701 [21]3 years ago

4 0

JoAnn works 43 hours a week. :)

sleet_krkn [62]3 years ago

3 0

JoAnn works 43 hrs week.

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Given A is between Y and Z, and YA=14x, AZ=10x and YZ=12x+48, solve for x

iren [92.7K]

Answer:The answers are: 4 40 56 96.

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4 years ago

Potatoes sell for $.25 per pound at the produce market.Write an equation for the cost c of p pounds of potatoes

morpeh [17]

I hope this helps you

if per pound is $25

how much cost ?

C=25/pounds

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3 years ago

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For what values of k

sergey [27]

If y = cos(kt), then its first two derivatives are

y' = -k sin(kt)

y'' = -k² cos(kt)

Substituting y and y'' into 49y'' = -16y gives

-49k² cos(kt) = -15 cos(kt)

⇒ 49k² = 15

⇒ k² = 15/49

⇒ k = ±√15/7

Note that both values of k give the same solution y = cos(√15/7 t) since cosine is even.

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3 years ago

Given the position of the particle, what the position(s) of the particle when it’s at rest

choli [55]

The position function of a particle is given by:

$X\mleft(t\mright)=\frac{2}{3}t^3-\frac{9}{2}t^2-18t$

The velocity function is the derivative of the position:

$\begin{gathered} V(t)=\frac{2}{3}(3t^2)-\frac{9}{2}(2t)-18 \\ \text{Simplifying:} \\ V(t)=2t^2-9t-18 \end{gathered}$

The particle will be at rest when the velocity is 0, thus we solve the equation:

$2t^2-9t-18=0$

The coefficients of this equation are: a = 2, b = -9, c = -18

Solve by using the formula:

$t=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}$

Substituting:

$\begin{gathered} t=\frac{9\pm\sqrt[]{81-4(2)(-18)}}{2(2)} \\ t=\frac{9\pm\sqrt[]{81+144}}{4} \\ t=\frac{9\pm\sqrt[]{225}}{4} \\ t=\frac{9\pm15}{4} \end{gathered}$

We have two possible answers:

$\begin{gathered} t=\frac{9+15}{4}=6 \\ t=\frac{9-15}{4}=-\frac{3}{2} \end{gathered}$

We only accept the positive answer because the time cannot be negative.

Now calculate the position for t = 6:

$undefined$

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2 years ago

Please help and explain how to solve these! Thanks

spin [16.1K]

2. C
Slope = 40/8 = 5
Slope of graph c = 5/1 = 5

3. D
Slope = 9/3 = 3
Slope of graph d = 81/27 = 3

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3 years ago

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