Which of the following expressions is equivalent to -9? a. 63 ÷ 7b. -63 ÷ 7c. -7 ÷ 63d. -63 ÷ (-7)

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

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer