The two angles on top are supplementary angles meaning they should add up to 180
72+3x=180
3x=180-72
3x=108
x=36
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There were 100 magazines altogether and she bought 50 of them.
Answer:
-3a+30
Step-by-step explanation:
-5a+30+2a.
-5a+2a=-3a
-3a+30
When you add any fractions, you need to find a common denominator. In this case they have no common factors so you just multiply them together. First multiply the first fraction by

which gets you

. Then multiply the second fraction by

to get

. Now you can add them together to get

.
(b)


now you can pull out root 2 and get

which equals