Find the tenth term of the sequence: -6,1,8...

Question

Is it 57?

For the sequence:2,4,8,16 the value of s4 is____.
Is it 8?

Find the 7th term of the sequence: 1,2,4,...
Is it 64?

Which term of this sequence is 275?
5,10,15,...
Is it 1357?

Find the 7thterm of an. Arithmetic sequence whose first term is -8and whose common difference is 3.
Is it 10?

Answer 1

Find the tenth term of the sequence: -6,1,8...
Is it 57? YES

For the sequence:2,4,8,16 the value of s4 is____.
Is it 8? If s4 means the sum of four terms, why not just add them up, they are there in front of you, sum(4) = 30

Find the 7th term of the sequence: 1,2,4,...
Is it 64? YES

Which term of this sequence is 275?
5,10,15,...
Is it 1357? Of course not
term(n) = a + (n-1)d
275 = 5 + (n-1)(5)
270 = 5(n-1)
54 = n-1
n = 55 , it is term(55)

Find the 7thterm of an. Arithmetic sequence whose first term is -8and whose common difference is 3.
Is it 10? YES

Answer 2

5. a tap can fill a tank in 15 minutes .another tap can empty it in 20 minutes. Initially the tank is empty, if both the taps start functioning the same time, when will the tank become fill?