The mean of 5 scores is 7. When an extra score is included, the new mean is 8. What is the extra score?

13

Step-by-step explanation:

Mean of  5 scores = 7

Sum of 5 scores = 7*5 = 35

New mean = 8

Sum of 6 scores = 8 *6 = 48

Extra score = 48 - 35 = 13

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

question: how many people can she serve?

answer: she can serve 16.66666667 people. so she can only give 16 people a complete serving.

question: does she have enough ice cream for her guests?

answer: no. explanation: she only has enough for 16 people to have a full serving. however, she can give a 17th person a partial serving.