## katiebugg a1 = 5, an = 3, n = 20 one year ago one year ago

1. amistre64

baking cupcakes are you?

2. katiebugg

no

3. katiebugg

find the sum of the arithmetic sequence having the data given.

4. amistre64

oh, thats doable then, use the formula: $\frac n2(a1+an)$

5. katiebugg

thanks!