A. 2.3+(-2.3) is equal to zero
b. (-3.7)+(-4.1) is positive
c. -2./4) is positive
d. (5/2)+(-2.5) is negative
e. ) is negative

A. True

B. False

C. True

D. False

E. False.

Step-by-step explanation:

A. 2.3 + (- 2.3) is equal to zero, which is true because 2.3 - 2.3 = 0

B. (- 3.7) + (- 4.1) is positive, which is false because - 3.7 - 4.1 = - 7.8

C.  - 2.6 - (- 12/4) is positive, which is true as - 2.6 - (- 3) = 0.4

D. (5/2)+(-2.5) is negative, which is false as (2.5) + (- 2.5) = 0

E. 72-(-100) is negative, which is again false as 72 - (- 100) = 72 + 100 = 172. (Answer)

4sqrt5

step-by-step explanation:

the base has dimensions of 8 x 4, so the diagonal is 64 + 16 square rooted or 4sqrt5.

4th option is correct xy=-10

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