Answer:
Q1. 20x = 200. The value of x is 10
Q2. 7 - 3x = 1. The value of x is 2.
Step-by-step explanation:
In order to find an equation, you have to let the number be any variable, such as m or n or z. So I will let the number be <em>x variable</em>. Then the question says a number is multiplied by 20 is equals to 200 :
Let number = x,
![x \times 20 = 200](https://tex.z-dn.net/?f=x%20%5Ctimes%2020%20%3D%20200)
![20x = 200](https://tex.z-dn.net/?f=20x%20%3D%20200)
![20x \div 20 = 200 \div 20](https://tex.z-dn.net/?f=20x%20%5Cdiv%2020%20%3D%20200%20%5Cdiv%2020)
![x = 10](https://tex.z-dn.net/?f=x%20%3D%2010)
Same for the next question. Given that a number multiplied by 3 :
Let number = x,
![x \times 3 = 3x](https://tex.z-dn.net/?f=x%20%5Ctimes%203%20%3D%203x)
Then subtracted by 7 equals to 1 :
![7 - 3x = 1](https://tex.z-dn.net/?f=7%20-%203x%20%3D%201)
![7 - 3x - 7 = 1 - 7](https://tex.z-dn.net/?f=7%20-%203x%20-%207%20%3D%201%20-%207)
![- 3x = - 6](https://tex.z-dn.net/?f=%20-%203x%20%3D%20%20-%206)
![- 3x \div - 3 = - 6 \div - 3](https://tex.z-dn.net/?f=%20-%203x%20%5Cdiv%20%20-%203%20%3D%20%20-%206%20%5Cdiv%20%20-%203)
![x = 2](https://tex.z-dn.net/?f=x%20%3D%202)
To graph
graph the point (3,6)
yintercept is on the y axis so go up 2 units from the origin and plot the point (0,2)
now the parabola
we know it has to go through points (3,6) and (0,2)
therefor we now that it opens down
we also knwo that the vertex's y value is the axis of symmetry
so we also put a point at (6,2)
draw a parabola opening down through the points (0,2) (3,6) (6,2), with (3,6) at the top/peak
see attachment
Step-by-step explanation:
10000, After 1 year amount = 11200 so interest after 1 year = 1200
Amount = P(1+R/100)T
11200 = 10000(1+R/100)1
R = 12%
Interest for the second year = 11200(1+12/100)1 - 11200 = 1344
after 3 years = 10000(1+12/100)3 = 14049.28