Answer:
it would take 40 pounds of pressure to break the board.
Step-by-step explanation:

Now we plug in the numbers of force and length

Now we multiply both sides by 2.5 to get rid of the fraction.

Now we plug in our variation constant

So we convert the length of 2.5 feet into inches. This is 18 inches. Since there are 12 inches in one foot, we have that 18 inches is equal to 18 divided by 12.
18÷12=1.5
We get that 18 inches is equal to 1.5 feet
we plug L = 1.5 into our inverse variation equation and solve for F.

This simplifies to F = 40
If you have any questions feel free to ask in the comments - Mark
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Answer:
5.428571
Step-by-step explanation:

take the fraction and divide that:

then just add 5:
5 + 0.428571 = 5.428571
or...
convert the mixed fraction to improper fraction:

divide like normal:

The answer to the questions is 1.851