Answer:
-4
Step-by-step explanation:
Let the number be x
If she multiplies the number by 2, it will become 2x
If divided by 4, it will be 2x/4, if she multiplies the result by itself, we will have:
2x/4(2x/4) = 4x/16
If she subtract the original number from 6 and divide by 10, we will have;
x-6/10
Equating both expressions
4x/16 = x-6/10
Cross multiply
4x(10)= 16(x-6)
40x =16x-96
40x-16x = -96
24x = -96
x = -96/24
x = -4
Hence the number is -4
$23
Mathias has $20 in a savings account. The interest rate is
5% per year and is not compounded. How much will he have in 3 years?
First think out the equation, once you've done that multiply 3 by 25 to get 75
To find the inverse of a function, replace all the x's with y's and all the y's with x's.
y= -3v(x+7) + 10
x= -3v(y+7) + 10
Now that we have a new function, we solve for y.
x-10= -3v(y+7)
-x-10=3v(y+7)
(-x-10)^3=y+7
y=(-x-10)^3 - 7
Now we have the inverse function.
