Me on this! offering 15 points to who if you need a close up on the question just ask me

Since the question doesn't state whether he wants his students to make the figure larger or smaller we can just find both.

Multiply by 3 to make the sides larger.

2 * 3 = 6 inches

3.1 * 3 = 9.3 inches

4.5 * 3 = 13.5 inches

3.9 * 3 = 11.7 inches

Divide by 3 to make the sides smaller.

2 / 3 = 0.66... inches

3.1 / 3 = 1.033... inches

4.5 / 3 = 1.5 inches

3.9 / 3 = 1.3 inches

Mark said 5 inches, so, he is incorrect.

Samantha said 6 inches, so, she is correct.

Divia said 1.3 inches, so, she is correct.

Cheng said 0.9 inches, so, he/she is incorrect.

Candice said 11.7 inches, so, she is correct.

Best of Luck!

1 5/6

Step-by-step explanation:

We first convert each mixed number to an improper fraction.

To change -6 7/8, we will ignore the negative at first.  Multiply the whole number by the denominator:

6(8) = 48

Add the numerator:

48+7 = 55

Putting the negative back in, we have -55/8.

To change -3 3/4, ignore the negative at first.  Multiply the whole number by the denominator:

3(4) = 12

Add the numerator:

12+3 = 15

Putting the negative back in, we have -15/4.

This gives us

-55/8 ÷ -15/4

To divide fractions, flip the second one and multiply:

-55/8 × -4/15

Multiply straight across:

(-55×-4)/(8×15) = 220/120

Simplifying this, we know that both 220 and 120 are divisible by 10; this gives us

22/12

Both 22 and 12 are even, so they are both divisible by 2.  This gives us

11/6

6 will go into 11 one time, with 5 remaining; this gives us

1 5/6