Answer:
Step-by-step explanation:
"two over three (4x + 9)":
<em>use the distributive property </em><em>a(b+c) = ab + ac</em>
X + 7 = - 3
x = - 3 - 7
x = - 10
Now put the value of x in 2nd equation,
- 10 - y = -3
- y = - 3 + 10
- y = 7
y = - 7
Perimeter=6+10+8+6+10+8=48 inches
area=48+36=84 inches squared
Answer:
0.8413 or 84.13%
Step-by-step explanation:
Given : The mean is 72 inches and the standard deviation is 15 inches
To Find : What is the probability that in a randomly selected year, the snowfall was less than 87 inches
Solution:
Mean =
Standard deviation =
Formula :
We are supposed to find the probability that in a randomly selected year, the snowfall was less than 87 inches
So, x = 87
Substitute the values in the formula
Now to find P(z<87) refer the z table
P(Z<87)=0.8413 = 84.13%
So, the probability that in a randomly selected year, the snowfall was less than 87 inches if the mean is 72 inches and the standard deviation is 15 inches is 0.8413 or 84.13%