Solve the equation -25+4y=35

2 answers:

8 0

To solve this we need to solve for y (try to leave y by itself)

-25+4y=35 to do this first you need to add (the opposite of subtraction) 25 on both sides (remember that the equation has to always be balanced) leaving you with 4y=60

after this the only function that attaches the 4 to the y is multiplication, so we do the opposite (division)

4y/4=60/4

y=15

now y is all by itself, meaning that we solved for y

hope this makes sense.

borishaifa [10]2 years ago

6 0

-25+4y=35
*Subtract 35*
-25+4y-35=0
*add 25 (to cancel out)*
4y-35=25
*add 35 (to cancel out)*
4y=60
*Divide by 4 to get y on its own*
y=15
Hope this helps :)

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schepotkina [342]

Answer:

C. 5 weeks.

Step-by-step explanation:

In this question we have a random variable that is equal to the sum of two normal-distributed random variables.

If we have two random variables X and Y, both normally distributed, the sum will have this properties:

$S=X+Y\\\\\ \mu_S=\mu_X+\mu_Y=30+60=90\\\\\sigma_S=\sqrt{\sigma_X^2+\sigma_Y^2}=\sqrt{10^2+20^2}=\sqrt{100+400}=\sqrt{500}=22.36$