Which number produces a rational number when multiplied by 0.5

What is the greatest common factor of 6a, 8a^{2}, and 14?

You are making a blueprint of your bedroom and you plan to use a scale factor of 18 . the actual width of your room is 14 feet and the actual length of your room is 16 feet. determine the width and length of your room on the blueprint. on the blueprint, your room will have a width of feet and a length of feet.

X+ y = 5 ; x - y =3 solve using linear combination