A truck left Auckland for its destination, travelling at 80km/hr. Two hours later, a car leaves Auckland, chasing the truck at 120 km/hr. The car catches up to the truck 30km before it reaches its destination. How far is it from Auckland to the truck’s destination?

The truck travelled in 2h=80(2)=160km

The time taken for truck in 30km=30/80=0.37h=20min

The time taken by car to cross =30/120=15min

The truck travelled in 15min=1/4(80)=20km

The trucks destination is 180km from Auckland

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.

there is nothing below so i cannot

step-by-step explanation: