If two secants intersect from a point outside of the circle, then the product of the lengths of the secant and its external segment equals the product of the other secant and its external segment.
#1
5(x+5) = 6(4+6)
5x + 25 = 6 * 10
5x = 60 - 25
5x = 35
x = 7
#2
4(x+4) = 3(5+3)
4x + 16 = 3 * 8
4x = 24 - 16
4x = 8
x = 8/4
x = 2
Okay. For these types of problems, you must do order of operations (PEMDAS). Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction. Mind you that you do these steps from left to right, and multiplication and division is done from left to right. Same thing with addition and subtraction. With that being said, here are your answers if you do the expressions correctly.
1. 12
2. 106
3. 42
A ton weighs 2000 pounds, so if you were to take 6 tons, it will be 12000 pounds.
<span>2n^3-n^2-136 :Equation:
Substitute 0 for n
</span> Simplify {20}^{3}<span> to </span><span>8000
</span>
<span>8000−<span>0<span><span>^2</span><span></span></span></span>−136
</span> Simplify <span>{0}^{2}<span></span></span><span> to </span><span>0
</span><span><span>8000−0−136
= 7864</span></span><span>
</span>
