The width of a human hair is about 1x10 to the -4 power meter wide. The width of a mechanical pencil lead is about 7x10 to the -4 power meter wide. About how many pieces of hair would it take to match the width of a piece of mechanical pencil lead?

step-by-step explanation:

addition

step-by-step explanation:

answer: number of steps anna and todd walk 150 and 250 respectively.

step-by-step explanation:

since we have given that

for every 3 steps of anna's steps , todd made 5 steps .

so, there will be ratio i.e.

so, the number of steps anna walk = 3x

the number of steps todd walk = 5x

according to question,

so,

number of steps anna walk is given by

number of   steps todd walk is given by