Given that Sn = 1a + (n-1)d1
find the value of Sn if a = 3,n= 10 and
express d in terms of Sn, n and a
2

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

The length of triangle base is 26. a line, which is parallel to the base divides the triangle into two equal area parts. find the length of the segment between triangle legs.

Evaluate the expression. (9 + 5)(3 + 2)0