Answer:
Step-by-step explanation:
There were three boxes of parts. one weighed 10 pounds, and you know the other two weigh the same. All three together weigh 30 pounds. How much do the two weigh?
Here the answer is 19/35
Step-by-step explanation:

We will apply BODMAS rule
In this rule multiplication comes before add and subtraction
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To find the slant height we must take apart the pyramid first. Let us cut it in half. There we can easily see that the slant height is really just the hypotenuse of the triangle formed by half the base and the altitude.
Half the base length would be 6 cm.
Using the Pythagorean therom:
a² + b² = c²
6² + 8² = c²
36 + 64 = c²
100 = c²
c = 10
The slant height should be 10 cm. Hope this helps!
Area is square units, so the new area would be the scale factor squared:
Scale factor is 2, so the area would increase by 2^2 = 4
The answer is B.4