#### Question

If a sequence has a first term of a_1=10 , and a common difference d=5 , Write the formula that describes this sequence. Use the formula of the arithmetic sequence.

Since we know the values of the first term, a_1=10 , and the common difference, d =5 , substitute these values in the arithmetic formula.

a_n=a_1+(n-1)d

We get,

a_n=10+(n-1)5

=5n+5