A construction crew is digging a hole on the first day they dug a hole 3 feet deep on the second day they dug two more feet on the third day they dug four more feet right is some or negative numbers to represent this situation find a total sum and explain how it is related to the problem

a. -9 feet b. We have that the hole is 9 feet deep

Step-by-step explanation:

a. Let's take the ground level to be our zero point. At first, on the first day, they dug a hole of 3 feet. This is represented by -3 feet since it is below ground level. On the second day, they dug two more feet, this is represented by -2 feet. On the third day, they dug four more feet, this is represented by -4 feet.

So, the total number of feet dug below ground level is thus -3 feet + (-2 feet) + (-4 feet) = -3 feet - 2 feet - 4 feet = -9 feet.

b. Since the sum is -9 feet, the negative implying below ground level. So, we have that the hole is 9 feet below ground level. That is, 9 feet deep.

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