If m∠4= 138°. Find m∠1, m∠2, and m∠3.
please explain how to work this out

The opposite angles are equal so m4=m1 and m2=m3. If you know m4=m1, m1= 138 so m4+m1= 276. That means m2 and m3 are equal to 84 in total. Your answer should be 48 for both m2 and m3 cuz they add to 84

There are two ways you could do it, one involves a calculator and one doesn't.

Calculator:
You would just do 4500 × 1.7 = $7650

Non-calculator:
First you'd divide 4500 by 10 to get 10%, which is 450. Then you'd multiply 450 by 7 to get 3150. Now you just add 4500 and 3150 to get $7650

I hope this helps!