PLEASE HELP The left-hand "tail of the standard normal curve can be defined as the part
that lies at least 2 standard deviations to the left of the mean.
According to the empirical rule, approximately what percentage of the area
under the whole curve is in the left-hand tail? Round your answer to the
nearest tenth.

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step-by-step explanation:

b

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

its line 2 i just added the rest or else it wouldn't let me answer