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An exponent tells how many times to multiply a number by itself: 2^3 = 2 × 2 × 2 = 8.
Squared means power 2: 5^2 = 25. Cubed means power 3: 3^3 = 27.
Order of operations: parentheses, exponents, multiply and divide, then add and subtract.
To evaluate 3x + 4 when x = 5, swap in 5: 3 × 5 + 4 = 19.
