Dennis let go of a penny at the top of a well, and the penny fell straight down to the bottom of the well. the top of the well was 1 1/2 meters above ground. the bottom of the well was 11 meters below ground.
the following equation describes the situation
1 1/2 +(-12 1/2)= -11
what does -12 1/2 tell us
a) the distance between ground level and the bottom of the well is 12 1/2 meters
b)the distance between the top of the well and the bottom of the well was 12 1/2 meters
c)none of the above

Question

Dennis let go of a penny at the top of a well, and the penny fell straight down to the bottom of the well. The top of the well was 1½ meters above ground.the bottom of the well was 1 meters below ground.

The following equation describes the situation

1½ +(-12½)= 11

what does -12½ tell us

It tells us about the distance between the top of the well and the bottom of the well was 12½

Step-by-step explanation:

When Dennis let go of he penny and the penny went into the well; expectedly, the penny will move straight down to the bottom, provided there's no barrier between the top and the bottom of the well.

If the well is 1½ above the ground and the and the distance between the penny and the ground is calculated as

Distance from top of the well - Depth of well.

Hence, 12½ represent the depth of the well or the distance between the top of the well and the bottom of the well

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8