James saved £15 per week for 100 weeks. How much did he have? How much would he have after 2 years
1 answer:
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Answer:
Hi there!
I will help you answering the questions, if you do not understand what I'm working about, you can ask me on comment section.
<h3>Number 1</h3>First of all, we need to multiple the separated function.
So the right answer is <u>A</u>
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<h3>Number 2</h3>the graph has four zeros at :
- -4
- -2/3
- 0
- 9
After that we make them equal with 0, here is the thing:
x = -a is equal with x + a = 0
So we can conclude that :
- -4 → x + 4 = 0
- -2/3 → 3x + 2 = 0
- 0 → x = 0
- 9 → x - 9 = 0
Then we substitute them to a function :
x(x + 4)(3x + 2)(x - 9) = 0
3x⁴ - 13x³ - 118x² - 72x = 0
Then we looking on the option which one is equal with the answer above.
The right answer is <u>B</u>
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Hope It Helps!