Remember that unit price how much money per one. For example, if the sale was $12 for 3apples ($12 / 3apples) the the unit price is $4 / apple.
Looking at your problem, 3 kg of wood for $5.55 is the same as $5.55 / 3kg. As a unit price, this is $1.85/kg. Simply divide the numerator by the denominator (5.55 divided by 3).
You can look at this as simplifying fractions.
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So 5 kg of wood for $7.50, or $7.50/5kg, would be $1.5 / kg.
Obviously, the better buy would be the cheaper one: $1.5 / kg.
Graph two lines that intersect at the point
Answer:
True, the scores are not valid.
Step-by-step explanation:
The test supposed to be measuring intelligence. We can assume that the intelligence of most people relatively stable (will not change too much over a short amount of time), and can expect it should go upward with brain growth and education. But the test seems to give a huge decrease from the first and second results. Then the third result is a huge increase that even higher than the first test.
We don't know the true value of the subject, but seeing the huge gap for every repetition we can tell that the test result lacks precision.
Circle C
hope this helped!