In a random sample of 50 specimens, the average porosity (in percent) was 21 and the standard deviation σ = 3. how many specimens must be sampled so that a 95% confidence interval specifies the mean to within equation .6?

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

Graph the line with the given slope m and y-intercept b. m=-3,b=1

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.