Expressions with One Variable

Feedback: Not quite! The expression is $20 + 5x$. After 5 months, Julia will have 20 + 5 × 5 = 45 (£).

Feedback: Not quite! The expression is $200 + 10x$. After 3 weeks, the library will have 200 + 10 × 3 = 230 books.

Feedback: Not quite! The expression is $100 - 8x$. After 12 days, you'll have 100 - 8 × 12 = 100 - 96 = 4 (£) left.

Feedback: Not quite! The equation is $1000 + 120x = 2000$. Solving for $x$, we get $x = \frac{2000 - 1000}{120} = 8$ days.

Feedback: Not quite! The expression is $50 + 15x$. After 7 days, the gardener will have 50 + 15 × 7 = 50 + 105 = 155 flowers in total.

Feedback: Not quite! The expression is $50 + 30 \times (x - 1)$. After 12 photos, x = 12, the photographer will charge: 50 + 30 × (12 – 1) = 50 + 30 × 11 = 50 + 330 = 380 (£).