Green Bridge Learning Resource Nchekwa Maka Exponential Growth And Decay

Gbogbo ọrọ náà

When a quantity grows or shrinks by the same percentage again and again, it changes exponentially: slowly at first, then dramatically. Savings with compound interest, a growing population and a depreciating car all follow this pattern, and the same compact formula describes them all.

In this lesson (Extended tier) you will model exponential growth and decay using a repeated percentage change, and use the formula to find a value after a number of steps.

Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Exponential Growth And Decay. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

A population of 5000 grows by 8% per year. Which expression gives the population after 3 years? A. 5000 x 3 x 1.08 B. 5000 x 1.08^3 C. 5000 x 0.08^3 D. 5000 + 1.08^3 Answer: B
A car worth $12 000 loses 15% of its value each year. What multiplier is used? A. 0.15 B. 0.85 C. 1.15 D. 1.85 Answer: B
$2000 grows at 5% per year compound. Its value after 2 years is: A. $2100 B. $2200 C. $2205 D. $2210 Answer: C
A quantity decays by 10% per step. After 2 steps a value of 100 becomes: A. 80 B. 81 C. 90 D. 100 Answer: B
Exponential growth means a quantity changes by: A. the same amount each step B. the same percentage each step C. a decreasing amount D. a random amount Answer: B