Answer: x = -1/8
Step-by-step explanation:
Given the equation 9^x+1 - 13(3^x)+4=0
First, open the bracket, multiply 13 by 3
9^x+1 - 39^x+4=0
Combine like terms
9^x - 39^x +4 +1=0
40^x+5=0
Make x the subject
40^x=0 -5
40^x= -5
Divide both sides by 40
40^x/40=-5/40
x = -1/8
I hope this is clear, please mark as brainliest answer.
Riley's age = r
Riley's brother's age = r/4
If Riley was 11 five years ago, Riley is currently 11 + 5 years old, or 16 years old.
Now we just need to use r/4 to find Riley's brother's age:
16 /4 = 4
Riley's brother is 4 years old.
Hope this helps!
Test
remember, (x,y)
A.
10=-3(-2)+4
10=6+4
10=10
yep, this is a soltuion
B.
5=-3(3)+4
5=-9+4
5=-5
false, not a solution
C.
4=-3(-2)+4
4=6+4
4=10
nope, not a solution
D.
1=-3(1)+4
1=-3+4
1=1
true
hmm, I think if B was (3,-5) then C is the only one
C is the answer
It lies first line have a nice day
First, convert 46 2/3 to a decimal, 46.66. Set up the equation like this and solve: (.4666)(28) = 13.0648 ≈ 13.1. So, 46 2/3% of 28 is 13.1.
