Answer:x^3+13x^2+3
Step-by-step explanation:
(2x^3+11x^2+5)-(x^3-2x^2+2)
Clearing brackets
2x^3+11x^2+5-x^3+2x^2-2
Collect like terms
2x^3-x^3+11x^2+2x^2+5-2
x^3+13x^2+3
Answer:
a. 7.2
b. 6
Step-by-step explanation:
Since the side lengths of similar polygons are proportional to each other, therefore:
![\frac{b}{10} = \frac{9}{15} = \frac{a}{12}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bb%7D%7B10%7D%20%3D%20%5Cfrac%7B9%7D%7B15%7D%20%3D%20%5Cfrac%7Ba%7D%7B12%7D%20)
Thus, let's find b using:
![\frac{b}{10} = \frac{9}{15}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bb%7D%7B10%7D%20%3D%20%5Cfrac%7B9%7D%7B15%7D%20)
Cross multiply
![b*15 = 10*9](https://tex.z-dn.net/?f=%20b%2A15%20%3D%2010%2A9%20)
![15b = 90](https://tex.z-dn.net/?f=%2015b%20%3D%2090%20)
Divide both sides by 15
b = 6
Let's find a using:
![\frac{9}{15} = \frac{a}{12}](https://tex.z-dn.net/?f=%20%5Cfrac%7B9%7D%7B15%7D%20%3D%20%5Cfrac%7Ba%7D%7B12%7D%20)
Cross multiply
9*12 = 15*a
108 = 15a
Divide both sides by 15
a = 7.2
The answer is 5.9% I think because you have to round up if it’s 5 and above
<span>Choose two equations and use them to eliminate one variable.Choose another pair of equations and use them to eliminate the same variable.<span>Use the resulting pair of equations from steps 1 and 2 to eliminate one of the two remaining variables.</span></span>