Step-by-step explanation:
Here, we'll need to multiply these two values together. I'll use the expansion formula, which goes as follows:


Lets apply this to the following equation:



- Remove parenthesis and add.

Answer:
x^2+10x+21
Let x be the number of rocks that George have at first.
First, George have x rocks. Then, he gets 5 new rocks. So, we have:

Next, half of his rock collection is given to Susan.

Susan got 36 rocks, so the equation is
Assuming the bases are laid out in a square, then we can use the Pythagorean Theorem to find the distance from home plate to second base.
This distance is exactly the length of the hypotenuse of the right triangle that forms when you split the square along the diagonal. Let this distance be x
Each of the legs are 90 ft, so a = 90 and b = 90. The hypotenuse is c = x for now.
a^2 + b^2 = c^2
90^2 + 90^2 = x^2
8100 + 8100 = x^2
16200 = x^2
x^2 = 16200
sqrt(x^2) = sqrt(16200) ... apply the square root to both sides
x = 127.2792206
x = 127.3 .... round to the nearest tenth (one decimal place)
The final answer is 127.3 feet
Answer:
Step-by-step explanation:
a)
![\sqrt[3]{81}=\sqrt[3]{3^4}=\sqrt[3]{(3^3)(3)}=3\sqrt[3]{3}](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7B81%7D%3D%5Csqrt%5B3%5D%7B3%5E4%7D%3D%5Csqrt%5B3%5D%7B%283%5E3%29%283%29%7D%3D3%5Csqrt%5B3%5D%7B3%7D)
This is irrational.
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b)
![\sqrt[3]{-64}=\sqrt[3]{(-4)^3}=-4](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7B-64%7D%3D%5Csqrt%5B3%5D%7B%28-4%29%5E3%7D%3D-4)
This is rational.
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Please be aware that 3 square root of 81 is not the same as cube root of 81.
![3\sqrt{81}\ne\sqrt[3]{81}](https://tex.z-dn.net/?f=3%5Csqrt%7B81%7D%5Cne%5Csqrt%5B3%5D%7B81%7D)
You can call a cube root what it is.