What is the order number of the set A= {-1,20,3,17,5} ?
1 answer:
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Answer:
2.(b) w= 3
3. x= -3 or x= 3
Step-by-step explanation:
2.(b) <u>Method 1:</u>
Simplify:
×5 on both sides:
Expand:
Bring constants to 1 side, w terms to the other:
Simplify:
Divide both sides by 3:
<u>Method 2:</u>
Multiply by 5 throughout:
Expand:
Simplify:
+9 on both sides:
-4w on both sides:
Simplify:
Divide by 3 on both sides:
3.
Multiply by 3x on both sides:
Expand:
Simplify:
Divide by 6 on both sides:
-9 on both sides:
Factorise:
*Since a²-b²= (a +b)(a -b),
Thus,
x +3= 0 or x -3= 0
x= -3 or x= 3
Answer:
Draw a line straight down from vertex A.
Step-by-step explanation:
You can look at the picture to see what I did. The purple line is perpendicular to line BC. I think that is what the question is asking for.
Perpendicular means that two lines intersect each other at a 90 degree angle, by the way.
