Answer:
10.6
Step-by-step explanation:
No it is an irrational number because it is a decimal with repeating numbers.
we are given
Since, we have to find inverse of this function
step-1: we set f(x)=y
step-2: switch x and y
step-3: Solve for y
now, we can use quadratic formula
or
..............Answer
The only way to do that is with +7 and -7 .
Answer:
4:1
Step-by-step explanation:
x+20 : y+20 = 5 : 2
(x+20)/(y+20) = 5/2
2(x+20) = 5(y+20)
2x+40 = 5y+100
2x = 5y+60 (1)
x-5 : y-5 = 5:1
(x-5)/(y-5) = 5/1
x-5 = 5(y-5)
x-5 = 5y-25
x = 5y-20 (2)
Solve (1) & (2) simultaneously,
2(5y-20) = 5y+60
10y-40 = 5y+60
5y = 100
y = 20
x = 5y-20
x = 5(20)-20 = 100-20
x = 80
x:y
80:20
4:1
