Answer:
x
Step-by-step explanation:
Add 7 to other side making equation 16x-71+7
16x-64
16 goes into -64 -4 times.
Answer would give you x-4
To check, you could substitute -4 into the inequality
16(-4)-7-71
-71-71 check
16(-10)-7-71
-167-71 check
Answer: why?
Step-by-step explanation:
Answer:
20
Step-by-step explanation:
y^2+4y-1=(-7)^2+4(-7)-1=(-7)(-7)-28-1=49-28-1=21-1=20
Answer:
n = 61 costumers
Step-by-step explanation:
For calculating the number of costumers he should sample we use the next equation:
Where E is the error that we are prepared to accept, in this case E = 0.15
How we don't know the value of p, we can estimate it like p = 0.5
∝ = 1-0.98 = 0.02
1-∝/2 = 0.99
n = 60.32 costumers
n ≈ 61 costumers