Answer:
25.1327cm
Step-by-step explanation:
C= 2πr
C=2π(4)
C=25.13274122
-5x(x+3)-7(x-3)/x^2-9= -5x^2-15x-7x+21/x^2-9= -5x^2-22x+21/x62-9
Answer:
a = -10
Step-by-step explanation:
solving inequation : a 
-6.5 so a = -10 complies
Answer:
-13a^2 + 170ab - 13b^2.
Step-by-step explanation:
1. 36(a+b)^2 - 49(a-b)^2
This is the difference of 2 squares: a^2 - b^2 = (a + b)(a - b).
36(a+b)^2 - 49(a-b)^2
= (6(a + b) + 7(a - b))( 6(a + b) - 7(a - b))
= (6a + 7a + 6b - 7b)( 6a - 7a + 6b + 7b)
= (13a - b)(-a + 13b)
If you require the expansion of this it is:
-13a^2 + 170ab - 13b^2.
Okay so to convert x=3y+6 into y intercept form you need to f<span>irst subtract x from both sides of the equation:
</span>x + 3y = 6
<span>(x + 3y) -x = 6 - x </span>
<span>3y = -x + 6 <-- (Which is the same thing as 6-x, but with x in front) </span>
<span>Now, to get rid of the 3 on the y side, divide by 3 on both sides of the equation (remember, what you do to one side you MUST do to the other side of the equation as well):
</span>(3y)/3 = (-x + 6)/3
<span>y = (-x/3) + 6/3 </span>
<span>or </span>
<span>y = (-1/3)x + 2 (Same thing, don't forget the negative) </span>
<span>y = mx + b </span>
<span>So the slope is (-1/3) and the y-intercept, b, is 2. </span>
<span>Hope you could understand that :3</span>
