Answer:
The last test score should be 73
Step-by-step explanation:
[tex]88 = \frac{( 87 + 94 + 86 + 100 + X )}{5}[/tex]
Add all the values in the parentheses together to get:
[tex]88 = \frac{367 + X}{5}[/tex]
You want to remove the 5 next, so you multiply both sides by 5.
[tex]5 * 88 = \frac{367 + x}{5} *5[/tex]
[tex]88 * 5 = 440[/tex]
You should get:
[tex]440 = 367 + x[/tex]
The last step is to subtract both sides by 367:
[tex]440 - 367 = 73[/tex]
[tex]X = 73[/tex]
I hope this helps!
