Which activity is a key area of number sense?

a. calculation of interest

b. calculation of a loan amount

c. application of symmetry

d. use of decimals

Answer with explanation:

When you talk about numbers, and the people who are aware of numbers , after knowing natural numbers and whole numbers , decimals came into existence because fractional value were being used that's why rational number was a set of numbers which came into existence.

So, why after natural number, whole number , was formed, because 0 which means nothing, was extremely useful number and added to set of natural numbers.

Then People started using Decimals, that is fractional number,

⇒Apart from, application of symmetry, as all the options are true regarding number sense,

So, Decimals was used or invented , after knowing about whole numbers and natural numbers

So, Key area of Number Sense is,

Option D: Use of Decimals

first anwser choice.

step-by-step explanation:

the greater/less or equal to symbol (> or < with the line at the bottom) is a closed/filled in circle.

-5c + 2 _< _27

subtract from both sides by 2

-5c _< _ 27

divide both sides by -5

c _< _ 5.4

flip the inequality sign

c _> _5.4

the only possible answer that would match the simplified inequality is the first answer choice

answer: it is d

step-by-step explanation: