Practice Problems

Hints

  1. Let's substitute ‍\(j = 2\) and ‍\(k = 6\) into the expression.
    • \(3+jk+k^3\)
    • \(=3+(2)(6) + 6^3\)
    • \(=3+12+216\)

    • \(=231\)

  2. Let's substitute ‍\(r = 6\) and ‍\(s = 5\) into the expression.
    • \(8r - rs\)
    • \(=8(6) - (6)(5)\)
    • \(=48-30\)

    • \(=18\)

  3. Let's substitute ‍\(p = 7\), \(m = 8\) and ‍\(n = 2\) into the expression.
    • ‍\(8 - \frac{m}{n} + p^2\)
    • ‍\(=8 - \frac{8}{2} + 7^2\)
    • \(=8 - 4 + 49\)

    • \(=53\)

  4. Let's substitute ‍\(g = 3\) and ‍\(h = 6\) into the expression.
    • \(\frac{9}{g} +2h +5\)
    • ‍\(=\frac{9}{3} +2(6) +5\)
    • \(=3+12+5\)

    • \(=20\)

Back to '1.2: Replacing Variables with Their Values'