Phone Numbers You remember part of your friend's 7-digit phone number, but you cannot remember the rest.
a. Your friend's number begins with 79 and ends with five other digits.
How many different phone numbers can begin with 79?

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.