PLEASE HELP ME!! Right a simplified rule for the nth term of the arithmetic sequence with a1=7 and the common difference is 3

= 3n + 4

Step-by-step explanation:

The n th term rule for an arithmetic sequence is

= a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Here a₁ = 7 and d = 3 , thus

= 7 + 3(n - 1) = 7 + 3n - 3 = 3n + 4

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