Can some also help me with these problems please.

5. ∠1.

6. ∠3.

7. ∠1.

8. 180°.

note: wherever there is a ∠ symbol, it means "angle".

Step-by-step explanation:

5. An exterior angle of the triangle is ∠1.

6. The remote interior angles of the triangle to the exterior angle 1 are ∠2 and ∠3.

7. The sum of the measure of angles 2 and 3 is equal to the measure of ∠1.

8. The sum of the measure of angles 1 and 4 is 180°.

note: wherever there is a ∠ symbol, it means "angle".

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

$15 each

step-by-step explanation:

$45/3 children= $15 each