In a class of 30 students, 21 play an instrument and 8 play a sport. There are 7
1 answer:
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To solve this algebraically, you can first factor out a 3:
Then, you can factor (I'm using guess and check) and my answer is -4 and 2:
From here on, finding 0s is very easy. You just solve for x in the parentheses. So, the 0s are when x = 4, and x = -2. Remember, (4-4) = 0, and (-2+2) = 0, that's what you want.
Then, you can factor (I'm using guess and check) and my answer is -4 and 2:
From here on, finding 0s is very easy. You just solve for x in the parentheses. So, the 0s are when x = 4, and x = -2. Remember, (4-4) = 0, and (-2+2) = 0, that's what you want.
Answer:
Step-by-step explanation:
<u>System Of Equations </u>
We know the scale shows a false reading for the weights by a constant value. Let's call e the weight it adds or subtracts from the real weight it measures.
When the box is put on the scale, the real weight is b, but the scale shows
When the bag is weighted, the real value is g, but the scale shows
Finally, when both are measures, the real weight is b+g and the scale shows
We have formed a system of equations. It's easy to find the value of b, we just need to subtract the last two equations