Which situation is described by the expression 30 − 4h?

Class 6AlgebraAlgebra

A30 more than 4 times h
B4 less than 30 times h
CA 30-page notebook from which 4 pages are used each day, after h days
D30 shared equally among 4 groups of h

Step-by-Step Solution

30 − 4h starts at 30 and removes 4 for every unit of h, which is exactly 30 pages with 4 used per day. '30 more than 4 times h' uses the same numbers but the opposite operation and would be written 4h + 30.

Answer: C) A 30-page notebook from which 4 pages are used each day, after h days

Key idea: Evaluating an expression

To evaluate an expression, **substitute** a value for the variable and compute. If

x = 5

, then

2 x + 3

becomes

2 \times 5 + 3 = 10 + 3 = 13

. The same expression with

x = 0

gives

2 \times 0 + 3 = 3

. Practise substituting — it is the bridge between an algebraic expression and a real number.

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