<span>the general solution of the nonhomogenous differential equation </span><span>Y'' + 4y = t^(2) + 3e^t is c2y + c1</span>
Answer:
C.
Step-by-step explanation:
So there are 20 kids with brown hair and this represents 80% of the class total.
So this means 20=.8n since we don't know the total number of kids.
20=.8n
Divide both sides by .8
25=n
So 25 is the total number of kids.
C. is the answer
You could also setup this equation given that 80% is 80/100:
[tex]\frac{20}{\text{ total }}=\frac{80}{100}
To figure out what that total is there you can divide top and bottom of the fraction on right hand side by 4 which gives you the 20 on top and the 25 on bottom.
Yes because if the original price is $42 and you take off the 30% it will be 12.6 plus the sale tax rate it will be $13.10 and he will have $21.90 left
Ax + bx = 21
factor out x
x(a + b) = 21
x = 21/(a+b)
