The mean of 12 numbers is 20 and the mean of another 8 numbers is 25 find the mean of the 20 numbers ​

22

Step-by-step explanation:

mean is calculated as

mean =

Given the mean of 12 numbers is 20 , then

= 20 ( multiply both sides by 12 )

sum = 240

Given the mean of 8 numbers is 25 , then

= 25 ( multiply both sides by 8 )

sum = 200

Total sum of the 20 numbers = 240 + 200 = 440, then mean of 20 numbers is

mean = = 22

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

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step-by-step explanation: