Answer:
D.
Step-by-step explanation:
1) the domain is x∈[0;+∞);
2) the solution is:
![\sqrt{x}\leq 10; \ => \ x\leq 100;](https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D%5Cleq%2010%3B%20%5C%20%3D%3E%20%5C%20x%5Cleq%20100%3B)
3) finally, the solution with the domain is:
x∈[0;100].
Answer:
![\large\boxed{\sqrt{130}\approx11}](https://tex.z-dn.net/?f=%5Clarge%5Cboxed%7B%5Csqrt%7B130%7D%5Capprox11%7D)
Step-by-step explanation:
![\sqrt{a}=b\iff b^2=a\\\\11](https://tex.z-dn.net/?f=%5Csqrt%7Ba%7D%3Db%5Ciff%20b%5E2%3Da%5C%5C%5C%5C11%3C%5Csqrt%7B130%7D%3C12%5C%5C%5C%5C%5Ctext%7Bbecause%7D%5C%2011%5E2%3D121%3C130%5C%20%5Ctext%7Band%7D%5C%2012%5E2%3D144%3E130%5Cto121%3C130%3C144.%5C%5C%5C%5C%5Ctext%7BWe%20calculate%20the%20difference%20to%20check%20closer%20to%20which%20number%20a%20given%20root%20is%7D%5C%5C%5C%5C130-121%3D9%5C%5C144-130%3D14%5C%5C%5C%5C%5Ctext%7Bcloser%20to%2011%7D)
Answer:
(2x+1)(x+3)
Step-by-step explanation:
Not much explaining for that...
This is a combination problem.
6 nCr 2
![\frac{6!}{2! * (6-2)!} = \frac{720}{48}=15](https://tex.z-dn.net/?f=%20%5Cfrac%7B6%21%7D%7B2%21%20%2A%20%286-2%29%21%7D%20%3D%20%20%5Cfrac%7B720%7D%7B48%7D%3D15%20)
<span><span>
</span></span>
<span>When 20 is increased by 30% of itself
</span><span>When 20 is added to by (30% OF 20)
</span><span>
20 + (30% x 20)
</span><span>20 + (0.3 x 20)
</span><span>
20 + (6)
</span>26