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3 years ago

13

In Ms. Craig’s class, 75% of the students are boys. There are 18 boys in the class. What is the total number of students in Ms.

Craig’s class? |QUICK! IM TIMED

1 answer:

topjm [15]3 years ago

5 0

Answer:

24

Step-by-step explanation:

75% of x = 18

75/100 * x = 18 (x = total number of students)

solving

x = 24

total number of students = 24

Checking:

75/100 * 24 = 18

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Leno4ka [110]

Use ratio and proportion

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2 years ago

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marta [7]

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(15 pts) 4. Find the solution of the following initial value problem: y"-10y'+25y = 0 with y(0) = 3 and y'(0) = 13

jolli1 [7]

Answer:

$y(x)=3e^{5x}-2xe^{5x}$

Step-by-step explanation:

The given differential equation is $y''-10y'+25y=0$

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Finding the values of r

$r^2-5r-5r+25=0\\\\r(r-5)-5(r-5)=0\\\\(r-5)(r-5)=0\\\\r_{1,2}=5$

We got a repeated roots. Hence, the solution of the differential equation is given by

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On differentiating, we get

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Apply the initial condition y (0)= 3 in equation (i)

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Now, apply the initial condition y' (0)= 13 in equation (ii)

$13=5(3)e^{0}+0+c_2e^{0}\\\\13=15+c_2\\\\c_2=-2$

Therefore, the solution of the differential equation is

$y(x)=3e^{5x}-2xe^{5x}$

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alukav5142 [94]

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3 years ago

Please help me with this!!

Sergeu [11.5K]

Answer:

yea

Step-by-step explanation:

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