Need this quick please! Select the correct answer.
1+ 3
Which expression is equivalent to 12 - 21
-
12 + 21 - 3
I +1 if no denominator equals zero?
3
O A
o
B.
1
12 – 21 – 3
1
12 – 40 + 3
1
12 + 2.1 – 3
I + 3
1+1
OC.
OD

C is the answer i think

Step-by-step explanation:

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.

6(h+1)/2=a

a=area

step-by-step explanation:

its the same thing as a square or rectangle but after multiplying two sides you need to divide it by two.