Answer:
She subtracted the two 10x's where instead you're supposed to add them together.
Step-by-step explanation:
The correct answer is A. All triangles' interior angles equal 180.
Answer:it’s 21 square units
Step-by-step explanation:do base x height then divide by 2 to get 21
Answer:
68
Step-by-step explanation:
Let x=adult tickets and y=child tickets
1) 15x+11y=1889
2) x+y=147
multiply equation 1 by -1/11 on both sides to get:
-(15/11)x-y=-171.73
add new equation with equation 2 to get
-4/11x=-24.73
Isolate x to get:
x=67.99999
Round up to get 68 adult tickets
Negative 6 plus positive 3 equals negative three.
