Please help! For a group experiment, your science class measured the fine-particulate
concentrations in the air at random places around campus, and estimated a
sample average of 22 ug/m3 (micrograms per cubic meter). If 144 readings
were taken, and the standard deviation of the sample measurements was
4 ug/m3, you are 99.7% confident that actual concentration of fine
particulates at the school is
A. 21 ug/m3 - 23 pg/m3
B. 18 ug/m3 - 26 pg/m3
C. 21.7 ug/m3 - 22.3 pg/m3
D. 21.3 pg/m3 - 22.7 ug/m3

Phyllis and chen are saving money to go to a football game. each friend starts with some money and saves a specific amount each week. phyllis made a graph to show the total she has saved at the end of each week. chen wrote an equation to show the total, y, he has saved at the end of each week, x. y = 15x + 15 compare the amount that each friend has when both friends start saving. select the correct answer from the drop-down menu to complete the statement. phyllis starts with $ and chen starts with $

Can someone me and plz do the problem

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?