The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

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?