Two types of phone operating system are being tested to determine if there is a difference in the proportions of system failures (crashes). fifteen out of a random sample of 150 phones with os1 had system failures within the first eight hours of operation. ten out of another random sample of 150 phones with os2 had system failures within the first eight hours of operation. os2 is believed to be more stable (have fewer crashes) than os1.

p ÷ r = tan(x)

step-by-step explanation:

given that there is a figure below shows a right triangle: a right triangle is shown with hypotenuse equal to q units and the length of the legs equal to p units and r units.

graph is missing so i will create the graph as per given information.

the angle between the legs having lengths p units and q units is y degrees. the angle between the legs having lengths r units and q units is x degrees.

now we need to find about what is p ÷ r equal to.

so we can use trigonometric ratio tan(x)=[altitude]/[base] to find the value of p ÷ r, because p is the altitude and r is the base.

p ÷ r=tan(x)

hence final answer is p ÷ r=tan(x).

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation:

um is there supposed to be a picture?

answer: i believe it is c

step-by-step explanation:

because 5+4=9 so it would be 3^9