Answer:
4
Step-by-step explanation:
Given that 


Now,


This can be written as
[as
]

[ by using equation (i)]
=4
Hence, 
Estimated amount of students in 7th grade is about 298
There Are 80 different ways a person can order a two course meal
The final price inculding tax after discount is $ 47 and expression used is:
Required expression = price of item - discount price + tax on item
<h3><u>Solution:</u></h3>
Given that 40% discount on an item costing $74 plus 7% tax
So cost of item = $ 74
Tax = 7 %
Discount = 40 %
The expression which can be used to find price after discount including tax is:
Required expression = price of item - discount price + tax on item
Let us first find the price after discount
Price after discount = cost of item - 40 % of cost of item
Price after discount = 74 - 40 % of 74

Thus the price after discount is approximately $ 44
<em><u>Now tax is 7 % which means 7 % of $ 44</u></em>
Price including tax = 44 + 7 % of 44
Price including tax = 
Thus the final price inculding tax after discount is $ 47
X= # of multiple choice questions
y= # of word problem questions
EQUATION 1:
x + y= 25
EQUATION 2:
3x + 4y= 90
STEP 1:
solve for one variable in equation 1
x + y= 25
subtract y from both sides
x= 25 - y
STEP 2:
substitute x=25-y in equation 2
3x + 4y= 90
3(25-y) + 4y= 90
75 - 3y + 4y= 90
75 + y= 90
subtract 75 from both sides
y= 15 word problems
STEP 3:
substitute y value to find x
x + y= 25
x + 15= 25
x= 10 multiple choice questions
ANSWER: There are 15 word problems and 10 multiple choice questions.
Hope this helps! :)