Answer:
Step-by-step explanation:
Amount paid for first 100 watches = (65% of 80) *100
![=\frac{65}{100}*80*100\\\\= 65*80\\= 5200](https://tex.z-dn.net/?f=%3D%5Cfrac%7B65%7D%7B100%7D%2A80%2A100%5C%5C%5C%5C%3D%2065%2A80%5C%5C%3D%205200)
Amount paid for next 50 watches = (55% of 80) * 50
![= \frac{55}{100}*80*50\\\\= 55 * 8 * 5\\\\= 2200](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B55%7D%7B100%7D%2A80%2A50%5C%5C%5C%5C%3D%2055%20%2A%208%20%2A%205%5C%5C%5C%5C%3D%202200)
Remaining watches = 280 -(100+ 55)
= 280 - 155 = 125
Amount paid for 125 watches = (45% of 80) *125
![= \frac{45}{100}*80*125\\\\= 45 * 20 * 5\\\\= 4500](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B45%7D%7B100%7D%2A80%2A125%5C%5C%5C%5C%3D%2045%20%2A%2020%20%2A%205%5C%5C%5C%5C%3D%204500)
Amount received by the watch maker = 5200 + 2200 + 4500
= £ 11900
Wat is help sheet, didn't help,
instructions unclear, got my calculator stuck in the ceiling fan
remember some simple exponential laws
![( x^{n} )(x^{m})=x^{n+m}](https://tex.z-dn.net/?f=%28%20x%5E%7Bn%7D%20%29%28x%5E%7Bm%7D%29%3Dx%5E%7Bn%2Bm%7D)
and
![\frac{x^{n}}{x^{m}} =x^{ n-m }](https://tex.z-dn.net/?f=%20%5Cfrac%7Bx%5E%7Bn%7D%7D%7Bx%5E%7Bm%7D%7D%20%3Dx%5E%7B%20n-m%20%7D)
![x^{-m}= \frac{1}{x^{m}}](https://tex.z-dn.net/?f=%20x%5E%7B-m%7D%3D%20%5Cfrac%7B1%7D%7Bx%5E%7Bm%7D%7D%20%20)
first one
![(2^{-6})(2^{3})=2^{-6+3}=2^{-3}= \frac{1}{2^{3}} = \frac{1}{8}](https://tex.z-dn.net/?f=%20%282%5E%7B-6%7D%29%282%5E%7B3%7D%29%3D2%5E%7B-6%2B3%7D%3D2%5E%7B-3%7D%3D%20%5Cfrac%7B1%7D%7B2%5E%7B3%7D%7D%20%20%3D%20%5Cfrac%7B1%7D%7B8%7D%20%20)
2nd one
![\frac{7^{5}}{7^{3}} =7^{ 5-3 } = 7^{2} = 49](https://tex.z-dn.net/?f=%20%5Cfrac%7B7%5E%7B5%7D%7D%7B7%5E%7B3%7D%7D%20%3D7%5E%7B%205-3%20%7D%20%3D%207%5E%7B2%7D%20%3D%2049%20)
third one
![(3^{-4})(3^{2})=3^{-4+2}=3^{-2}= \frac{1}{3^{2}} = \frac{1}{9}](https://tex.z-dn.net/?f=%20%283%5E%7B-4%7D%29%283%5E%7B2%7D%29%3D3%5E%7B-4%2B2%7D%3D3%5E%7B-2%7D%3D%20%5Cfrac%7B1%7D%7B3%5E%7B2%7D%7D%20%20%3D%20%5Cfrac%7B1%7D%7B9%7D%20%20)
dunno wat to do with 'help sheet'
Answer:
-7≤x≤7
Step-by-step explanation:
The domain is the input values
X goes from -7 to 7 inclusive
With the interest rate his bank account will grow $36 dollars each year which after fiver years is $180 so the amount in the end will be $780