Devon has 14 steel balls of equal weight. If he puts 8 of them in one pan of a balance, and the rest along with a weight of 20 g
2 answers:
Answer:
D)
Step-by-step explanation:
For the pans to balance each other they must have both equal weight on them, this can be described in an equation like this:
Weight on side A=Weight on side B
It is described for us the weight on each side:
-The weight on side A will be the weight of 1 ball eight times( because we have 8 balls of the same weight). Lets say the weight of one ball is so it will be like this:
Weight on side A
-The weight on side B will be the weight of 1 ball 6 times (becasue we have 6 balls of the same weight) plus 20 grams that we added to balance the pans and make them equal so it will be like this:
Weight on side B
Now replacing on the first eqation we would have:
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Answer:
x = 3/2 or x = -4
Step-by-step explanation:
The identifiable error the students have is that before the left hand side of the equation is factorized, the right hand side value of 12 ought to be brought to the left hand side, leaving a net value of zero on the right hand side. Then whatever is factored on the left hand side is then equated to zero and then we can find the two values of x after setting each of the individual factors to zero
We proceed as follows;