exam Maths Puzzle Numerical Ability

Hi! I have a question. I am done with all my homework but i am stuck on one question. Do you know what exponential form of 10 is??

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exam Other Question

Raquel had two spinners. She spun both spinners at the same time and recorded which spinner landed on the highest number. Using the spinners at right, A usually won. Can you pr avg speed to car 1 = 55 mph
avg speed of car 2 = 70 mph
time elapsed between start of car 1 and start of car 2 = 4 minutes
how long before cars2 overtakes car 1?