80+10x is the expression. To find the cost for 9 guests, simply plug in 9 for x. This becomes an equation reading 80+10(9)=170. The total cost for 9 guests is $170.00.
Think about the fact that you can have two types of isosceles triangle: one of them that is a right triangle (isosceles right triangle) such as a 45-45-90 triangle and the other type can be just a regular triangle that has two sides that are congruent but it isn't a right triangle.
Thus, you would need more info about the triangles in order to conclude that the two isosceles triangles are congruent to each other.
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We are asked to find how many terms are in
.

- A term is a thing that's added or subtracted.
So let's compute the number of terms in this expression.
The first term is
.
Is anything added or subtracted from 10y²?
Sure!
is subtracted from 10y².
Also, 8 is added to -3y.
Thus, this expression has 3 terms.
Hope it helps you out! :D
Ask in comments if any queries arise.
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R/10 = 18/30
30r = 180
r = 6
The value of r is 6
Dowloand mw it help you you can do it there 13.50*23