She can find out answer by dividing 21÷3 and the answer is 7
She can make 7 bird house
A line adds up to equal 180 degrees. And adjacent angles also add to equal 180 since they share a side on a line. So add them together and make them equal 180
9x - 7 + 8.5x + 4 = 180
17.5x - 3 = 180
17.5x = 183
x = 10.5
180-53 is 127 angle 6 and 3 would be the same so your answer is 127
I'm pretty sure the answer is B) 11c+8.5(c-46)=470
hope i help :)
Answer:
perpendicular
Step-by-step explanation:
