What is the sum?

-2.8 + 5.35

A.

-8.15

B.

-2.55

C.

2.55

D.

8.15

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In scientific notation negative exponents represent very large numbers greater than 10 true or false

Ordering real numbers least to greatest -√270, 16 3/10, - 50/30, - 16.5 ... i mark brainliest!

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Niki scored a 78 on her first test and an 85 on her second. Niki forgot what she got on her third test bit she knows that her average is an 85. What did she score on her third test? Write and sole an equation for this problem.

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Find the sum (3x^2+5x-8) + (5x^2-13x-5)