Substitution means putting numbers in place of letters to calculate the value of an expression. The bracket has been worked out first. \(2 + (-8)^2 = 2 + 64\). \(-8^2\) means \(-8 \times -8\), which ...

Use the formula D = 2B + 4C to find the value of D when B = 5 and C = 3. 1. Write in the meaning of 2B (2 × B) and 4C (4 × C): ...