Answer:
2 sqrt(15)
Step-by-step explanation:
Using the secant tangent formula
(whole secant) x (external part) = (tangent)^2
(5+7) * 5 = x^2
12*5 = x^2
60 = x^2
Taking the square root
sqrt(60) = sqrt(x^2)
sqrt(4*15) = x
2 sqrt(15) =x

Use the formula: (a+b)(a-b) = a^2 - b^2
![x^4 - [(x^2)^2 - 1^2]\\\\x^4 - (x^4-1)\\\\x^4 - x^4 + 1\\\\\boxed{\bf{1}}](https://tex.z-dn.net/?f=x%5E4%20-%20%5B%28x%5E2%29%5E2%20-%201%5E2%5D%5C%5C%5C%5Cx%5E4%20-%20%28x%5E4-1%29%5C%5C%5C%5Cx%5E4%20-%20x%5E4%20%2B%201%5C%5C%5C%5C%5Cboxed%7B%5Cbf%7B1%7D%7D)
No matter what the value of 'x' is, the final answer will always be
1.
Answer:
Step-by-step explanation:
Answer:
I'm not completely sure, but I think the correct answer is option D.
<u>The cost of 10 Pencil will be .56</u>
Step-by-step explanation:
Given that the
cost of 25 pencils=1.40
cost of one pencil =1.40/25=.056
so, the cost of 10 pencil will be=.056*10=.56