Answer:
3/171
Step-by-step explanation:
The problem can be simplified into finding probability that Anna and Becky select 12 or 24 or 36 which are less than 40 and multiples of 3 and 4.
Probability of Anna selecting 12 = 1/9
Probability of Becky selecting 12 = 1/19
Probability of Anna and Becky selecting 12 = 1/9 * 1/19 = 1/171
Probability of Anna and Becky selecting 12 or 24 or 36 = 3* 1/171 = 3/171
The price of the camera after the increase was $315 you multiply 450 by .50 and then you get 225 next you multiply 225 times .40 and you get 90 you then add 90 to 225 and you get 315
Write the formula: A=a+b/2(h). Sub in what you know: 9=a+b/2(1). Divide by the height: 1: 9=a+b/2. Multiply by 2: 18=a+b. Now a is typically smaller than b so my guess would be a=6 b=12 but you could pick any numbers as long as they equal 18 :)