Question

1. 6.8 = 2.89 + m

m = 3.9, 3.91, 4, 4.11

1. d ÷ 5.20 = 2.40

d = 10.92, 16.12, 17.68

1. 8c = 64

c = 6, 7, 8, 9

1. m - 63.28 = 14.92

m = 77.86, 78

Explanation:

Problem 7: \( 6.8 = 2.89 + m \)

Step 1: Isolate \( m \)

Subtract \( 2.89 \) from both sides of the equation:
\( m = 6.8 - 2.89 \)

Step 2: Calculate the result

\( 6.8 - 2.89 = 3.91 \)

Problem 8: \( 8c = 64 \)

Step 1: Isolate \( c \)

Divide both sides by \( 8 \):
\( c = \frac{64}{8} \)

Step 2: Calculate the result

\( \frac{64}{8} = 8 \)

Problem 9: \( d \div 5.20 = 2.40 \)

Step 1: Isolate \( d \)

Multiply both sides by \( 5.20 \):
\( d = 2.40 \times 5.20 \)

Step 2: Calculate the result

\( 2.40 \times 5.20 = 12.48 \) (Wait, the given options for \( d \) are \( 10.92, 16.12, 17.68 \) – maybe a typo? If we use \( d = 2.40 \times 5.20 \), the correct \( d \) is \( 12.48 \), but if we check \( 12.48 \div 5.20 = 2.40 \), that works. However, if the options are as given, perhaps a miscalculation. Assuming the problem is correct, \( d = 12.48 \).)

Problem 10: \( m - 63.28 = 14.92 \)

Answer:

s:

• Problem 7: \( m = \boldsymbol{3.91} \)
• Problem 8: \( c = \boldsymbol{8} \)
• Problem 9: \( d = \boldsymbol{12.48} \) (or check the given options for accuracy)
• Problem 10: \( m = \boldsymbol{78.20} \) (or check the given options for accuracy)