John runs a computer software store. Yesterday he counted 125 people who walked by the store, 66 of whom came into the store. Of the 66, only 21 bought something in the store. (Round your answers to two decimal places.) (a) Estimate the probability that a person who walks by the store will enter the store.

(b) Estimate the probability that a person who walks into the store will buy something.

(d) Estimate the probability that a person who comes into the store will buy nothing.

A. Divide number of people in the shop by total people walking by:

66/125 = 0.528 = 0.53

B. Divide people who bought something by total people walking by:

21/125 = 0.168 = 0.17

d. 66 -21 = 45 people don’t buy anything.

45/66 = 0.68

30 people weigh 160 pounds or more

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct