14. find the error hiroshi is determining -42 – (-37). find his
mistake and correct it.
c - 42 - (-37) = 42-37

Hiroshi's error was not having changed the sign of the number 37 by removing the parentheses and placing -37 instead of +37.

Step-by-step explanation:

we have

Hiroshi's work

Remember that

a negative number is just a positive number multiplied by -1

and (-1)(-1)=+1

so

Correct work

therefore

Hiroshi's error was not having changed the sign of the number 37 by removing the parentheses and placing -37 instead of +37.

The crop yield increased by 9 pounds per acre from year 1 to year 10.

Step-by-step explanation:

To solve this we are using the average rate of change formula: , where:

is the second point in the function

is the first point in the function

is the function evaluated at the second point

is the function evaluated at the first point

We know that the first point is 1 year and the second point is 10 years, so and . Replacing values:

Since represents the number of pounds per acre and the number of years, we can conclude that the crop yield increased by 9 pounds per acre from year 1 to year 10.