Serena is writing an expression that is equivalent to 12ab - 6b, but she has not completed it.

- 1)

what is missing from the expression?

a.6b
b.6ab
c.6
d. ab

The correct expression is (A) 6b.

Step-by-step explanation:  Given that Serena is writing an expression  that is equivalent to (12ab - 6b), but she has not completed it.

The incomplete expression is ?(2a - 1).

We are to find the missing term from the above incomplete expression.

We have

Thus, the complete expression is 6b(2a - 1).

Option (A) is correct.

solution:

we have to construct

∠m nt ≅ ∠p qr

the steps to draw this construction are

step 1: use a compass to draw an arc from point q which intersects the side pq at point a and the side qr at point b.

step 2: draw a segment nt and use the same width of the compass to draw an arc from point n which intersects the segment nt at a point x.

step 3:

step 4: join points n and y using a straightedge.

step 3:

option (d).maintaining the same width of the compass as ab, draw an arc from point x such that it intersects the arc drawn from n in a point y.

to draw   congruent angles , 1. width of compasses while drawing two angles should be same i.e from point at which angle has to be drawn, 2.the distance between the two points where the compass intersects the two sides should be same while drawing any two congruent angles.