Combine like terms.
4a + b + a
a.
4a + 4b
b.
5a + 5b
c.
5a + b
d.
4ab

Its due ! write an equation in which the quadratic expression 2x^2-2x 12 equals 0. show the expression in factored form and explain what your solutions mean for the equation. show your work.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.