Combine like terms:
14.3m-6+m^2-5m+1
15.7x+4(2x-6)
16.b^2+3+2b^2+4-7
17.3(p+5)-8+11p

Plz hurry evaluate the expression a+b where a=8 and b=19

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth

Which expression is the factorization of x^2+10+21