Seven values are 3, 3, 3, 4, 5, 8 and x. The mean of these seven values is equal to twice their mode.
Calculate the value of x.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

the answer is c hope this