Which of the following statements are true? I. The difference between -1.4 and -8.3 is positive.
II. -1.4 + 8.3 has the same value as the difference between -1.4 and -8.3.
III. The difference between -8.3 and -1.4 has the same value as the difference between -1.4 and -8.3.

A. None of the statements are true.
B. All of the statements are true.
C. I and II
D. I only

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81