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Ostrovityanka [42]

3 years ago

7

Pauline withdrew $7.50 from her savings account every day for 3 days. Which expression is the best choice to help her determine

the total amount of money she withdrew? A.(7.50)(−3) = −22.50; she withdrew $22.50 B.(−7.50)(3) = −22.50; she withdrew $22.50 C.(−7.50)(−3) = 22.50; she withdrew $22.50 D.(7.50)(3) = 22.50; she withdrew $22.50

2 answers:

pishuonlain [190]3 years ago

6 0

Answer:

b

Step-by-step explanation:

i took the test trust

blsea [12.9K]3 years ago

3 0

B; (-7.50)(3) = -22.50

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Step-by-step explanation:

Given

See attachment for complete question

Required

Determine the equilibrium solutions

We have:

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To solve this, we first equate $\frac{dR}{dt}$ and $\frac{dW}{dt}$ to 0.

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$0.09R(1 - 0.00025R) - 0.001RW = 0$

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$-0.02W + 0.00004W*0 = 0$

$-0.02W + 0 = 0$

$-0.02W = 0$

$W=0$

So, we have:

$(R,W) \to (0,0)$

Hence, the points of equilibrium are:

$(0,0)$ $(4000,0)$ and $(500,79)$

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