Answer:
7×7+7
49+7
=56
order of operations multiply first then add
Calculation for plan A:
Let numbe of months = x
Given that $10 is the monthly fee.
Given that $150 is the joining fee.
Then cost equation for plan A is given by:
A=10x+150
Calculation for plan B:
Let numbe of months = x
Given that $30 is the monthly fee.
Given that $50 is the joining fee.
Then cost equation for plan B is given by:
B=30x+50
Now we have to find on what month will the cumulative costs of the plans be equal.
So we will just set both equations equal to each other
10x+150=30x+50
150-50=30x-10x
100=20x
5=x
Hence it will take 5 months to make cost of both plans equal.
To find the total cost plug x=5 into any of above equations:
A=10x+150=10*5+150=50+150=200
Hence final cost will be $200.
Answer:
7) 
. 8)
Step-by-step explanation:
7)
Here we have two different types of faces.Bottom face and side faces which are equivalent.
To calculate the area of a trinagle we have the formula of area to be
where a is the height of the triangle and b is the base of the triangle.
here let us first calculate the area of the bottom face,
now for the top faces which are similar, areas would be
Hence the total area is
8)
As we have seen in the above question area for a traingle would be
and for rectangle would be 
where l and b are the lengths and breaths of the rectangle.
Area of traingles would be ,
Area of rectangles would be,
Hence the total area is
When you do the inverse operation which in this case would be subtraction you do 54-17 and then you do 17 minus 17 which leaves you with the variable 54-17=34 so k=34
