Un = 2n + 1 for n = 1, 2, 3, ...
so U22 = 2*22 + 1 = 45
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If you mean -1 3 7 11 15 then the nth term is 4n-5 and so the next term will be 19
This is arithmetic progression with common difference of minus three...Formula:First Term +[ (number of term you want-1)*(common difference which is negative 3)]ExampleFor the 3RD term: -5=1+[(3-1)*(-3)]=1+[-6]= -5For 5TH term: -11=1+[(5-1)*(-3)]=1+(-12)=-11.: For the 21st term:=1+[(21-1)*(-3)]=1+[-60]= -59:D
That would be -5.
It is: nth term = 5-4n and so the next term will be -19
5 wholes and 3 over 11 as a decimal = 5.27275 3/11= 5 + (3 ÷ 11)= 5 + 0.2727= 5.2727