20 points! .. which expression is equivalent to the given expression? −(1/2y + 1/4)

a. −1/4 (1+2y)
b. 1/4 (2y−1)
c.−2 (1/4y−1/8)
d. 2 (1/8−1/4y)

Step-by-step explanation:

- (1/2y + 1/4)distribute thru the parenthesis

-1/2y - 1/4

A. -1/4(1 + 2y)...distribute thru the parenthesis

    -1/4 - 2/4yreduce and rearrange

    -1/2y - 1/4

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

click to let others know, how is it

0.0

0 votes

1

report

read more on -

step-by-step explanation:

wfirfkfr/jjfi; jn; p/ojkfvlbvmkmgkgkkkgkkg

step-by-step explanation: