Select all of the expressions that are equivalent to 4square root 5 a.2square root 20 b.6 1/2 - 5 1/2 c. 3*5 1/2 + 5 1/2 d 4*5 1/2 e.2square root 10 f.3*5 1/2

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step-by-step explanation:

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."

10 x 12 = 120 the tens to conte like 10,20,30,40 so i did that 12 times

the answers are

1. 2

2. 5

3. symmetrical