Answer:
x ≤ 7.25
Step-by-step explanation:
1)
≤ 
<u>Distribute</u> <em>5</em> through the parenthesis.
2)
≤ 
Move the <u>variable</u> to the left side and change it's sign.
3)
≤ 
Move the <u>constant</u> to the right side and change it's sign.
4)
≤ 
Subtract the <u>like terms</u>.
5)
≤ 
Divide both sides of the inequality by <em>-2</em>.
6)
≤ 
2×7=14
14÷7=2
hope this helps
Answer:
Since Tracy is charged $29 for 250 free minutes so:
For x ≤ 250, f(x) = $29
tracy is charged an extra $0.35 per minute for calls over 250 minutes, so:
For x ≥ 250, f(x) = 29 + 0.35(x - 250)
Answer:
The conclusion is that the researcher was correct
Step-by-step explanation:
From the question we are told that
The sample size is 
The sample mean is 
The standard deviation is 
The significance level is 
The Null Hypothesis is 
The Alternative Hypothesis is 
The test statistic is mathematically represented as

Substituting values


Now the critical value for
is

This obtained from the critical value table
So comparing the critical value of alpha and the test value we see that the test value is less than the critical value so the Null Hypothesis is rejected
The conclusion is that the researcher was correct