Mathematics

Sassafras

24 November, 19:54

The calculator shows the result that Luiza got after

evaluating the expression 9 (52 + 18) + 42. She checked

her work by rounding all of the values to the nearest ten and

comparing it to the calculator result. Which is true regarding

her estimate and the accuracy of her calculator result?

1.) The estimated result is 560, which suggests the

calculator is correct.

2.) The estimated result is 740, which suggests the

calculator is incorrect.

3.) The estimated result is 840, which suggests the

calculator is incorrect.

4.) The estimated result is 1,100, which suggests the

calculator is incorrect.