Assuming the 2nd one is 4a^2 - 20a +25, it is the one you're looking for. It factors to be (2a-5)^2
First question
42 students
Second question 65%
Answer:
x=4
Step-by-step explanation:
5-3(2x-7)=5-6x+21=-6x+26
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12-5(x-2)=12-5x+10=-5x+22
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-6x+26=-5x+22
-6x-(-5x)=22-26
-6x+5x=-4
-x=-4
x=4
Hi there! The third option shows us the best setup.
We can find the area of a triangle with the standard formula area = 1/2 * base * height.
To be able to fill in this formula, we need to have a base and a height. We can't easily find a triangle with given base and height, so we must look for another option.
We can also take the area of a square (length × width) and then divide the answer by 2. This is possible when we take the third setup. Hence the third answer is correct.