Answer:
Answer is 
.
Step-by-step explanation:
Total teens = 28
12 teenagers, in total, had a sister
7 teenagers, in total, had a brother
3 teenagers had both a sister and brother.
To get the required probability, we will consider the following two details:
3 teenagers have both a brother and sister and 12 have a sister.
Therefore, the probability that a randomly selected teenager who has a sister also has a brother will be = 
Answer is .
Answer: The Emerald Bot clicks 3 times in __0.4_ sec
²/₁₅ second per click × 3clicks = ²/₅ sec
Or 0.1333 × 3 = 0.3999 Round to 0.4
Step-by-step explanation: If its unit rate is 7.5 clicks per second, we can find the time, seconds per click by dividing one second by 7.5 clicks
1/7.5 = 0.13333 seconds per click.
Multiply that ²/₁₅ seconds by the 3 clicks to get the time it takes for the 3 clicks.
Remember that a dilation stretches or compresses an object based on a given scale factor, therefore, the correct option is C
The sum of any geometric sequence (if it converges, r^2<1) is of the form:
s(n)=a(1-r^n)/(1-r), a=initial term, r=common ratio, n=number of terms...
s(n)=30(1-0.4^n)/(0.6)
s(n)=50(1-0.4^n)
Since r<1 the sum of the infinite series is just:
s=50
