62 = 8x - 10
Add 10 to both sides
72 = 8x
Divide by 8
x = 9
Answer:
B
Step-by-step explanation:
Well first exponiantial growth, always increases. so
The first one goes
which we can see that doesn't apply
The second one goes
the third one goes
the fourth one goes
so the only options are the second one and the fourth one, but when the exponent is negative the function should decrease so the answer is B
Sample size= n= 84
sample mean= x = 107 s
population standard deviation =σ= 11.7
As, population standard deviation is given so we use the estimate:
x(+/-) z(α/2)(σ/√n)
At 99% Confidence interval means significance level is α=1-0.99= 0.01
So,
α/2=0.005
Now, z at α/2=0.005
z= 2.576
Now, by putting values
107(+/-)((2.576)(11.7/√84))
( 107-((2.576)(11.7/√84)), 107+((2.576)(11.7/√84)) )
(103.7, 110.288)
28/32 reduces to 7/8
42/48 reduces to 7/8
equivalent fractions are proportionate....so yes, they are proportionate
