Ibought 8 shirts that cost an average of $27. my sister then added 3 shirts. the 11 shirts had a mean cost of 28.50. how much did my sister’s shirts cost? need by tomarrow can u also put how u got it so i get it

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

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?

Which must be true in order for the relationship △zyv ~ △xwv to be correct? zy ∥ wx ∠z ≅ ∠y and ∠w ≅ ∠x zv ≅ vy and wv ≅ vx ∠z ≅ ∠x and ∠w ≅ ∠y