Question

Question was provided via image upload.

Explanation:

Step1: Solve 5×2.2

Round 2.2 to 2, estimate $5×2=10$. Multiply 5×22=110, insert 1 decimal place: $5×2.2=11.0$

Step2: Solve 3×0.12

Round 0.12 to 0, estimate $3×0=0$. Multiply 3×12=36, insert 2 decimal places: $3×0.12=0.36$

Step3: Solve 2.75×7

Round 2.75 to 3, estimate $3×7=21$. Multiply 275×7=1925, insert 2 decimal places: $2.75×7=19.25$

Step4: Solve 12.5×4

Round 12.5 to 13, estimate $13×4=52$. Multiply 125×4=500, insert 1 decimal place: $12.5×4=50.0$

Step5: Solve 8×4.2

Round 4.2 to 4, estimate $8×4=32$. Multiply 8×42=336, insert 1 decimal place: $8×4.2=33.6$

Step6: Solve 14.1×2

Round 14.1 to 14, estimate $14×2=28$. Multiply 141×2=282, insert 1 decimal place: $14.1×2=28.2$

Step7: Solve 7.6×3

Round 7.6 to 8, estimate $8×3=24$. Multiply 76×3=228, insert 1 decimal place: $7.6×3=22.8$

Step8: Solve 9×3.9

Round 3.9 to 4, estimate $9×4=36$. Multiply 9×39=351, insert 1 decimal place: $9×3.9=35.1$

Step9: Solve 5.2×7

Round 5.2 to 5, estimate $5×7=35$. Multiply 52×7=364, insert 1 decimal place: $5.2×7=36.4$

Step10: Solve 3.172×5

Round 3.172 to 3, estimate $3×5=15$. Multiply 3172×5=15860, insert 3 decimal places: $3.172×5=15.860$

Step11: Solve 14×0.28

Round 0.28 to 0.3, estimate $14×0.3=4.2$. Multiply 14×28=392, insert 2 decimal places: $14×0.28=3.92$

Step12: Solve 17×9.5

Round 9.5 to 10, estimate $17×10=170$. Multiply 17×95=1615, insert 1 decimal place: $17×9.5=161.5$

Step13: Calculate total earnings

First find total hours: $(2×4.5)+(2×6.5)=9+13=22$ hours. Multiply by hourly rate: $22×7.50=165.00$

Answer:

1. $11.0$
2. $0.36$
3. $19.25$
4. $50.0$
5. $33.6$
6. $28.2$
7. $22.8$
8. $35.1$
9. $36.4$
10. $15.860$
11. $3.92$
12. $161.5$
13. $\$165.00$