I assume you want to solve this equation for b. If that is the case, merely divide both sides of this equation by 5:
5b = -35
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5 5
Then b = -7 (answer)
F(x)= 5.50n +45
5.50 per child with every child being n just means 5.50×n or 5.50n. 45 being added to the equation as it is the starting point of the total party cost.
To put this in simpler form, you combine like terms:
-4j - 1 - 4j + 6
-8j - 1 + 6
final answer: -8j + 5
Keep in mind that a lot of teachers teach math sifferently, so the way I was taught could be different from the way you earned. This was one of the simplest ways to do it.
Well it would be 210because if u multiply it would give you 210