Answer:
Step-by-step explanation:
To find the slope of a line which is perpendicular to another line, you need to find the opposite reciprocal of the first line's slope.
To find the opposite, flip the slope's sign. Your original slope is 
, so your opposite slope is positive 
.
To find the reciprocal, flip the fraction. This changes your slope from to 
, which may be written as just 7.
Therefore, your slope is 7.
To find your b term (your y-intercept) given that your x-intercept is -7, you can make use of point-slope form.
<em>(m=slope)</em>
If your x-intercept is -7, then the point at which your line intersects the x-axis is (-7, 0).
Answer:
30 x 12 divided by 2 is 180
Step-by-step explanation:
180 is your answer
Formula of a triangle is:
BH x 1/2
Answer:
56
Step-by-step explanation:
Start with the innermost parenthesis 1+3=4, now moving outwards we have -9(4)=-36, we now have 60-36=24, 2(24)=48, 14+48=62, -6+62=56
Answer:
quotient
Step-by-step explanation:
Answer:
The lower bound for a 90% confidence interval for the percentage of all American adults who believe in ghosts is 0.3549
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of 
, and a confidence level of 
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of 
.
For this problem, we have that:
90% confidence level
So 
, z is the value of Z that has a pvalue of 
, so 
.
The lower limit of this interval is:
The lower bound for a 90% confidence interval for the percentage of all American adults who believe in ghosts is 0.3549
