Which of these scales are equivalent to 3 cm to 4 km? select all that apply. recall that 1 inch is 2.54 cm
1. 0.75 cm to 1 km
2. 1 cm to 12 km
3. 6 mm to 2 km
4. 0.3 mm to 40 m
5. 1 inch to 7.62 km

1. 0.75 cm to 1 km

4. 0.3 mm to 40 m

Step-by-step explanation:

we have the scale

Verify each case

case 1) 0.75 cm to 1 km

therefore

The scale is equivalent to the given value

case 2) 1 cm to 12 km

therefore

The scale is not equivalent to the given value

case 3) 6 mm to 2 km

Remember that

1 cm= 10 mm

1 mm=0.1 cm

we have

therefore

The scale is not equivalent to the given value

case 4) 0.3 mm to 40 m

Remember that

1 cm= 10 mm  -----> 1 mm=0.1 cm

1 km=1,000 m ----> 1 m=0.001 km

we have

therefore

The scale is equivalent to the given value

case 4) 1 inch to 7.62 km

Remember that

1 in= 2.54 cm

we have

therefore

The scale is not equivalent to the given value

i think it would be 42cm