Agraphing calculator displays 1.89 x 10^12 as 1.89e12. how do you think it would display 1.89 x 10^-12? what does the e stand for?

What you need to know for this case is that the calculator is using the scientific notation in two different ways:

Way 1:

Way 2:

Where, in both cases:

a, b: they are real numbers.

Therefore, for the following number:

We have an equivalent way is:

The e refers to the exponent to which the base 10 is elevated.

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)