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2 years ago

7 more than 5 times a number is 122

Mathematics

1 answer:

Luba_88 [7]2 years ago

4 0

Answer:

The number is 23.

Step-by-step explanation:

5n + 7 = 122 Subtract 7 on both sides

5n = 115 Isolate the variable by dividing 5 on both sides

n = 23

<h3><u><em>Hope this helps!!! </em></u></h3><h3><u><em>Please mark this as brainliest!!! </em></u></h3><h3><u><em>Thank You!!! </em></u></h3><h3><u><em>:)</em></u></h3>

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35% of the students at charles drew middle school are 6th graders if there are 84 sixth graders what is the total number of stud

Juliette [100K]

Answer: The total number of student in the school = 240.

Step-by-step explanation:

Let x be the total number of students in the school.

Given: 35% of the students at Charles drew middle school are 6th graders.

i.e. Number of sixth graders = 35% of x = 0.35x [35% = 0.35]

Since there are 84 sixth graders in the school,

So $0.35x=84$

Divide both sides by 0.35, we get

$x=\dfrac{84}{0.35}=\dfrac{84\times100}{35}=240$

Hence, the total number of student in the school = 240.

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2 years ago

if you deposit $8000 into an account paying 9% annual interest compunded semi anually how long will it take for your money to do

Anna007 [38]

Answer:

7.87 years

Step-by-step explanation:

#First we determine the effective annual rate based on the 9% compounded semi annual;

$i_m=(1+i/m)^m-1\\\\=(1+0.09/2)^2-1\\\\=0.09203$

#We then use this effective rate in the compound interest formula to solve for n. Given that the principal doubles after 2 yrs:

$A=P(1+i)^n\\\\A=2P, i=i_m\\\\16000=8000(1.09203)^n\\\\2=1.09203^n\\\\n=\frac{log \ 2}{log \ 1.09203}\\\\=7.87324\approx7.87 \ yrs$

Hence, it takes 7.87 years for the principal amount to double.

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2 years ago

5x + 15 = 2x +3<br> x = what

gladu [14]

$5x + 15 = 2x + 3 \\ 5x + 15 + 3 = 2x \\ 5x + 18 = 2x \\ 18 = 2x - 5x \\ - 3x = 18 \\ x = \frac{18}{ - 3} \\ \\ x = - 6$

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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