At a school sports meet the high-jump bar is set at 90 cm for the first round and is raised by 5 cm after every round.

At what height, in centimetres, is the bar in the 13th round?

Question

At a school sports meet the high-jump bar is set at 90 cm for the first round and is raised by 5 cm after every round. At what height, in centimetres, is the bar in the 13th round?

Accepted Answer

150. a = 90, d = 5. The bar has been raised 12 times before the 13th round, so a_13 = 90 + 12*5 = 90 + 60 = 150 cm. Counting 13 raises instead of 12 gives 155 and counting 11 gives 145; 60 is only the total rise, with the starting height of 90 cm left out.

At a school sports meet the high-jump bar is set at 90 cm for the first round and is raised by 5 cm after every round.

At what height, in centimetres, is the bar in the 13th round?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 nth Term of an AP practice

At a school sports meet the high-jump bar is set at 90 cm for the first round and is raised by 5 cm after every round.At what height, in centimetres, is the bar in the 13th round?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 nth Term of an AP practice

At a school sports meet the high-jump bar is set at 90 cm for the first round and is raised by 5 cm after every round.

At what height, in centimetres, is the bar in the 13th round?