The speed of pickup of ridesharing services like Uber and lift seems to have surpassed that of ambulance services. The main response time of ambulances across the United States is 15.3 minutes with a standard deviation of 12.8 minutes. For rides sharing services, the mean pick up time across United States is 8 minutes with the standard deviation of 5.2 minutes. Based on these estimates, which of the following gives the standard deviation of the sampling distribution of the difference in sample means for samples of 30 ambulance rides and 40 ridesharing rides (ambulance - ride sharing)?
A) 12.8/sqt.30 + 5.2/sqt.40
B) 12.8/sqt.30 - 5.2/sqt.40
C) sqt. 12.8^2/30 + 5.2^2/40
D) sqt. 12.8^2/30 - 5.2^2/40

well what you have to do is divide 84 by 6 so theanswer

step-by-step explanation:

84 divided by 6 = 14

and that lightbulb changing party must be freaking lit!

2/3=10/15

1/5=3/15

10+3=13/15

2 13/15 is the answer

150

step-by-step explanation:

answer-

the equation that models this pattern is

solution-

a researcher placed a petri dish with 32,000 bacterial cells. one hour after being placed in the vacuum chamber, the number of cells in the petri dish had halved. another hour later, the number of cells had again halved.

this can be represented as exponential decreasing function,

where,

putting the values,

y-intercept means, where x=0, so

the coordinate of this poin will be (0, 32000)

this means when x=0 or at the starting of the research, the number of bacteria cells was 32000.

after 3 hours, number of bacteria cells will be,

the   coordinate of this point will be (3, 4000)