Substitue 2x for y in the second equation:
Rearrange to
Factor:
Zeros are
To find y-coordinates of pts of intersection, plug these x-values into first equation to get
Find the function value of f(4) if f(x)=3x-2
2 answers:
You might be interested in
Substitue 2x for y in the second equation:
Rearrange to
Factor:
Zeros are
To find y-coordinates of pts of intersection, plug these x-values into first equation to get
Answer:
Step-by-step explanation:
Data given and notation
represent the sample mean given
represent the population standard deviation
sample size
represent the value that we want to test
t would represent the statistic (variable of interest)
State the null and alternative hypotheses.
We need to conduct a hypothesis in order to check if the true mean for the gasoline prices is lower than 1.25, the system of hypothesis would be:
Null hypothesis:
Alternative hypothesis:
If we analyze the size for the sample is > 30 but we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:
(1)
Calculate the statistic
We can replace in formula (1) the info given like this: