Survey of 140 people: 51 had a dog,
40 had a cat,
16 had a dog and a cat,
56 had neither a dog nor a cat nor a parakeet,
2 had a dog and a cat and a parakeet.

How many had a parakeet only?

you can't solve x because it is 2 linear equation and you only have one equation

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92