Answer:
0.02272
Step-by-step explanation:
4x+ 4(10)=64
4x+ 40 =64
4x=24
x=6
If you need I can explain the steps more but I hope this helps!
First we should write the total numbers:
12+8+6+4=30
then we should divide the number 30 by 360(because the pie chart is 360 degrees):

now we should multiply 12(the number of students who likes rock) by 12

the answer is 144 degrees
This can be displayed as 5x = 28 - 2x
We can solve for the value of x by making the following changes:
<u>Add 2x to both sides</u>
7x = 28
<u>Divide by 7</u>
x = 4