The answer is: -3r+15r
you will multiply -3*5 first then -3*-r
Sure, what are the questions?
Answer:

Step-by-step explanation:
We know that a triangle has 3 sides, A triangle's interior angles add up to 180 degrees.
Now, let's write this as an equation:

The missing angle is 180° minus the sum of the other two angles.

Subtract the numbers:


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Answer:
-159
Step-by-step explanation:
Step 1 :
4
Simplify ——
-1
Equation at the end of step 1 :
(-4 • 42) + 9
Step 2 :
Final result :
-159
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Answer:
47
Step-by-step explanation: