Answer:
11a + 3
Step-by-step explanation:
Step 1 : 8a + 3 - 5a - 2a
error => - 5a
8a - (- 3 - 5a) - 2a =
= 8a + 3 + 5a - 2a
= (8a + 5a - 2a) + 3
= 11a + 3
11a+3
8a-(-3-5a)-2a
Open the bracket first
8a+3+5a-2a
Collect like terms
8a+5a-2a+3
13a-2a+3
So the final answer is 11a+3
The error is the that when you open the bracket the minus outside the bracket will multiply everything inside the bracket...and -×-=+
12x-6
perimeter= 2l+2w
=2(x+4)+2(5x-7)
=2x+8+10x-14
=12x-6
456 students
38% = 0.38
1200 x 0.38 = 456
-2
rise over run or, y2-y1/x2-x1
