Answer:
the last one
Step-by-step explanation:
Answer:
The null hypothesis ![H_o : \mu = 31](https://tex.z-dn.net/?f=H_o%20%3A%20%20%5Cmu%20%3D%20%2031)
The alternative hypothesis ![H_a : \mu > 31](https://tex.z-dn.net/?f=H_a%20%3A%20%20%5Cmu%20%3E%20%2031)
Step-by-step explanation:
From the question we are told that
The population mean is ![\mu = 31 \ miles / gallon](https://tex.z-dn.net/?f=%5Cmu%20%3D%20%2031%20%5C%20%20miles%20%2F%20gallon)
Generally
The null hypothesis is that the company's new sedan, the Libra, will have an average of ![\mu = 31 \ miles / gallon](https://tex.z-dn.net/?f=%5Cmu%20%3D%20%2031%20%5C%20%20miles%20%2F%20gallon)
This mathematically represented as
The null hypothesis ![H_o : \mu = 31](https://tex.z-dn.net/?f=H_o%20%3A%20%20%5Cmu%20%3D%20%2031)
The alternative hypothesis is that the company's new sedan, the Libra, will have an average better than ![\mu = 31 \ miles / gallon](https://tex.z-dn.net/?f=%5Cmu%20%3D%20%2031%20%5C%20%20miles%20%2F%20gallon)
This mathematically represented as
The alternative hypothesis ![H_a : \mu > 31](https://tex.z-dn.net/?f=H_a%20%3A%20%20%5Cmu%20%3E%20%2031)
Answer:
It can either be 4 or 5
Step-by-step explanation:
It is because of how 4x5 is equal to 9 so they are both sides.
Answer:
The train traveled 90 miles in 40 minutes.
Step-by-step explanation:
40 minutes is
of an hour. Because the speed is in miles/hour, we just need to multiple the distance by the time in hours to get the new distance.
135 ×
= 90 miles
The train traveled 90 miles in 40 minutes.
Answer: -2a^3 + 9a^2 + 45a + 18b^2 + 6ab^2
Step-by-step explanation:
(a + 3) * (-2a^2 + 15a + 6b^2)
We open the brackets with (a + 3)
a ( -2a^2 + 15a + 6b^2) + 3(-2a^2 + 15a + 6b^2)
Opening the brackets
= a * -2a^2 = -2a^3
a * 15a = 15a^2
a * 6b^2 = 6ab^2
3 * -2a^2 = -6a^2
3 * 15a = 45a
3 * 6b^2 = 18b^2
Let's arrange those values weve gotten together ,don't forget the signs each carry
= -2a^3 + 15a^2 + 6ab^2 - 6a^2 + 45a + 18b^2
Collect the like terms
= -2a^3 + 15a^2 - 6a^2 + 6ab^2 + 45a + 18b^2
= -2a^3 + 9a^2 + 6ab^2 + 45a + 18b^2