<span>This property is called associativity. It shows that it doesn't matter whether you perform the sum on the first two numbers and then the third, or on the second two and then the first, because you will get the same answer either way. That is because addition is associative.</span>
There are 180 degrees total in a triangle and the tell you one angle is 90. So you solve the equation 4x+6x=90. So x=9
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HI!!! I believe your answer is option a because it looks like your not multiplying anything so hope this helps:)
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Answer:The answer is 1 and 3
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