Do this for a cookie plz ;)

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

5cakes cost 3.50 how much do 7 cakes cost

Which two properties of equality could zoe use to finish solving for x? the equation is 3x - 4 = -10 for x so a either the addition or subtraction property of equalityb ether the multiplication or division property of equality c ether the addition or division property of equality d ether the subtraction or division property of equality just a simple a b c or d plz.