exam Maths Puzzle Numerical Ability

Thank you in advance for helping me with writing this problem in interval notation. The absolute value of 5n-2<2 I have 0

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exam Other Question

Two scientists leave a university in seperate vans at the same time. The first scientist travels east at 20 mph and the second scientist travels west at 25 mph. If there radios have a range of 90 miles, how long before they lose radio contact? Can someone help me with this problem?

I need to evaluate the followig expression:

(18 - 3) x 5

Thanks,
Lyn