# trig

posted by .

a grocery store display consists of cases of soda. there are 15 cases at the base, and 1 case at the top. if there are 15 rows, how many cases are needed for the entire display? a) 180 b)30 c)130 d)15

• trig -

looks like an arithmetic series

sum of terms of AS = (n/2)(first + last)
= (15/2)(15+1) = 120

check:
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15 = 120

## Similar Questions

1. ### math

Palmer Cheese Company is a small manufacturer of several different cheese products. One product is a cheese spread sold to retail outlets. Susan Palmer must decide how many cases of cheese spread to manufacture each month. The probability …
2. ### math 12

without looking at cases Jamie just puts the CDs into cases. The cases belong to the CDs. how many different ways can the CDs be put in the cases?
3. ### math

a grocery store display consists of cases of soda. there are 15 cases at the base, & 1case at the top. if there are 15 rows, how many cases are needed for the entire display?

Ellison's Jewlers displays charms for bracelets in trays that hold 36 charms each the store has 637 charms to put on display in 5 display cases. How many charms are left after the trays are filled ?
5. ### Physics

Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. A.)In …
6. ### Physics

Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. a.) …
7. ### Physics

Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. a.) …
8. ### Math

Gabby has 130 insects in her bug collection that have wings and 70 that have pincers. She wants to buy display cases for her collection. Each display cases should have an equal number of insects with wings and pincers. If she wants …
9. ### Middle School Math

The marching band is selling cases of fruit for \$13 per case. a. Write an algebraic expression for the cost of f cases of fruit. b. Evaluate the expression for 250 cases. Question 17 options:
10. ### History

How does the federal court system decide which criminal cases to take?

More Similar Questions