Find the sum of the first 41 terms of the following series , to the nearest integer 4,12,20,...

Can someone me with the property questions for 12 13 and 14 plz

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.

(30 points). the population of a city is 45,000 and decreases 2% each year. if the trend continues, what will the population be aer 15 yrs