Answer:
2
Step-by-step explanation:
Rise = 2
Run = 1
2/1 = 2
First make an inequality to solve for x
(x + 45) + [(x + 45) - 30] + [2x + (x + 45)] = 180
x = 15
now plug x back into each equation and solve
first angle = 60°
second angle = 30°
third angle = 90°
Answer:
11
Step-by-step explanation:
PC=QC=RC
3x+7=51-x
3x+x=51-7
4 x=44
x=11
Answer: One pound of cinnamon costs $12.80
Let n = required random sample size.
Assume that the population standard deviation is known as σ.
Let m = sample mean.
At the 95% confidence level, the expected range is
(m - k(σ/√n), m + k(σ/√n))
where k = 1.96.
Therefore the error margin is 1.96(σ/√n).
Because the error margin is specified as 3% or 0.03, therefore
(1.96σ)/√n = 0.03
√n = (1.96σ)/0.03
n = 128.05σ²
This means that the sample size is about 128 times the population variance.
Answer:
Smallest sample size = 128.05σ², where σ = population standard deviation.