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4 years ago

In problem 12, the first one x=7 please explain how to find that answer

Mathematics

2 answers:

riadik2000 [5.3K]4 years ago

7 0

Add all of the students together and you get 87. Subtract 87 from the total number of students (94) and you get 7.

gizmo_the_mogwai [7]4 years ago

6 0

X = 7 because there are 94 students total. If you add the others: 17+3+5+12+15+17+10+8 it equals 87. 87+7=94, aka the total amount of students.

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Answer:

Therefore rate of payment = $ 3145.72

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Consider A represent the balance at time t.

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Rate payment = $k

The balance rate increases by interest (product of interest rate and current balance) and payment rate.

$\frac{dB}{dt} = rB-k$

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$\Rightarrow C= \frac{k}{r} -7864$

Then the general solution is

$B(t)=\frac{k}{r}-( \frac{k}{r}-7864)e^{rt}$

To determine the payment rate, we have to put the value of B(3), r and t in the general solution.

Here B(3)=0, r=0.13 and t=3

$B(3)=0=\frac{k}{0.13}-( \frac{k}{0.13}-7864)e^{0.13\times 3}$

$\Rightarrow- 0.48\frac{k}{0.13} +11614.98=0$

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Therefore rate of payment = $ 3145.72

Therefore the rate of interest = ${(3145.72×3)-7864}

=$1573.17

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