Arlene is showing her work in simplifying -7.9 + 8.2 - 3.4 + 2.1 identify any errors in her work or in her reasoning. IF YOU ANSWER ILL GIVE YOU ALL POINTS -7.9 + 8.2 - 3.4 + 2.1 original form

-7.9 + 8.2 + (-3.4) + 2.1 Additive inverse

-7.9 + (-3.4)) + 8.2 + 2.1 Associative property

(-7.9 + (-3.4)) + (8.2 + 2.1)
Commutative property

-11.3 + 10.3 simplify

-1 simplify

Acircle has a circumference of 28.36 units what is the diameter of the circle

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3