Given the triangle below, what is measure of angle b

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)