Somebody anybody help me please

Which of the equations is the correct representation of the following word problem?

A student has two grades of 80 and 90. What grade must the student make on the next test to pass the class with a 90-grade average?

A. (80 + 90 + z)/3z = 90

B. (80 + 90 + x)/3 = 90

C. (80 + 90 + n)/3 = 100

D. (80 + 90 + 90)/3 = y

B. (80 + 90 + x)/3 = 90

Step-by-step explanation:

choice b is correct

step-by-step explanation:

we have been given the following system of inequalities;

we are required to graph the solution to the system of inequalities. using a graphing tool, the graph of the system is as shown in the attachment. the continuous line represents the graph of while the dotted line represents .

i got 142 as my answer

step-by-step explanation: