Answer:
3x(3x + 2)
Step-by-step explanation:
(4x2 - 2x) - (-5x2 - 8x)
= 4x2 - 2x + 5x2 + 8x.
= 4x2 + 5x2 - 2x + 8x.
= 9x2 + 6x.
= 3x(3x + 2).
I hope it is right.
Answer: A = k =250
B= y,x=0.5
Step-by-step explanation: Find the constant of variation.
New pump:
5 hours = 1 pool
1 hour = 1/5 pool
Old pump:
15h = 1 pool
1h = 1/15 pool
If both work together
1h = 1/5 + 1/15 = 4/15 pool
4/15 pool = 1 hour
1/15 pool = 1/4 hour
15/15 pool = 1/4 x 15
1 pool = 3.75 hours or 3 hours 45 mins
Answer:
∴ x= 17
Step-by-step explanation:
the total of angel in 90°
∴ 2x+3+3x+2 =90
∴ 5x +5 =90
5x=90-5
5x = 85 (divide both side by 5)
∴ x= 17
-2/3 <em>b</em> + 4 = 0
Add -4 to both sides to eliminate the 4 on the left:
-2/3 <em>b</em> + 4 - 4 = - 4
-2/3 <em>b</em> = -4
Multiply both sides by -3/2 to eliminate the -2/3 on the left:
-3/2 • (-2/3 <em>b</em>) = -3/2 • 4
<em>b</em> = -12/2
Simplify the solution:
<em>b</em> = -6
