An automobile battery manufacturer claims that its midgrade battery has a mean life of 50 months with a standard deviation of 6 months. Suppose the
distribution of battery lives of this particular brand is approximately normal.
6a. On the assumption that the manufacturer's claims are true, find the
probability that a randomly selected battery of this type will last less than 48
months.
Your answer
6b. On the same assumption, find the probability that the mean of a random
sample of 36 such batteries will be less than 48 months.
Your answer

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

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.

answer: (x+2) (x+3) are the binomials for your question : )

the answer is  

d.

21

i did this one. so you should get it right.