Question

i need help this please^

Answer 1

Answer:

21

Step-by-step explanation:

The sum of the angles in a triangle is 180.

1. So we know that 42+(5p-7)+(2p-2)=180.
2. Since it is addition and subraction, you don't need parentheses. 42+5p-7+2p-2=180.
3. Combine like terms, 33+7p-180.
4. Subract 33, 7p=147.
5. Divide by 7 to isolate p, p=21.

Double check, 42+(5[21]-7)+(2[21]-2)=42+(105-7)+(42-2)=42+98+40=180.