The mean of 6 numbers is 15. The numbers are in the ratio 1:3:4:7:7:8. Find the median.

the median is 5.5

Step-by-step explanation:

since the numbers are already from low to high, I can tell the middle numbers are 4 and 7. so add the numbers 4,7 and divide by 2, which you should end up with 5.5 as the median.

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

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 -