Answer:
17.5
Step-by-step explanation:
According to the study 70% of the internet searches used Google as search engine.
Thus if the event X is the proportion of the searches using Google engine, then expected value of the event X, E(X) = 0.7
From here we can find the expected number of internet searches of a sample of 25 people by multiplying 25 and 0.7, i.e 25*0.7=17.5
Answer:
4 units right and 3 units up.
Hope this help o(*￣▽￣*)o
I'll start 18 and 22 for you, and you should then be able to do the rest on your own!
For 18, what we literally do is apply the distance formula for all the points and add them up. For B to C, we get the distance between them to be
sqrt((x1-x2)^2+(y1-y2)^2)=sqrt((0-4)^2+(3-(-1))^2)=sqrt((-4)^2+4^2)=sqrt(16+16)=sqrt(32). Repeat the process for C to E, E and F, and F to B then add the results up to get your answer!
For 22, since the area of a rectangle is length*width (we know given the right angles and that the opposite sides are equal in how long they are), we can multiply 2 perpendicular lines, for example, BC and CE to get sqrt(32)*sqrt(8)=16 as the area
Answer:
6
Step-by-step explanation:
(n- 1)(n)( n +1)=210
n(n²-1)=210
n³-n= 210
n³-n-210=0
let n = 6 => 6³-6-210 = 216-6-210 = 0 (true)
so, n = 6
