Critical Thinking Will the value of 11x for x = –5 be greater than 11 or less than 11? Explain.

(i) Critical Thinking Write two different algebraic expressions for the word phrase “ of the sum of x and 7.”

(ii) What’s the Error? A student wrote an algebraic expression for “5 less than a number n divided by 3” as What error did the student make?

(iii) Write About it Shashi used addition to solve a word problem about the weekly cost of commuting by toll tax for ₹ 15 each day. Ravi solved the same problem by multiplying. They both got the correct answer. How is this possible?

Challenge Write an expression for the sum of 1 and twice a number n. If you let n be any odd number, will the result always be an odd number?

Match Column I with Column II in the following:

At age of 2 years, a cat or a dog is considered 24 “human” years old. Each year, after age 2 is equivalent to 4 “human” years. Fill in the expression [24 + 4(a – 2)] so that it represents the age of a cat or dog in human years. Also, you need to determine for what ‘a’ stands for. Copy the chart and use your expression to complete it.