exam Maths Puzzle Numerical Ability

what is the value of e in 7e+4=5e-8

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exam Other Question

Solve the inequality.

m + 15 > -4 Here are your choices.

1.) m > 11
2.) m < 11
3.) m > -19
4.) m < -19

Any help would be helpful? Martina leaves home at 9 A.M., bicycling at a rate of 24 mi/h. Two hours later, John leaves, driving at the rate of 48 mi/h. At what time will John catch up with Martina?