Start by finding a common denominator.
In this case, it would be 21.
So, -12/21 + -28/21= -40/21
PEMDAS
(9)(5) + 8
45 + 8
53
2/3 of 18...." of " means multiply
2/3 * 18 = 36/3 = 12....she has memorized 12 words so far
Yes.
the properties of an isosceles trapezoid are:
- the bases are parallel
- opposite sides are congruent
- the angles on either side of the bases are congruent
- the diagonals are congruent
