exam Maths Puzzle Numerical Ability

Help! I am not familiar with a TI 83. I need to give four ordered pairs for this, y = 7^x
I had x values of -15, 0, 15, and 30.
The y values that showed up I did not understand, it said 2E-13, 1, 4.7E12, and 2.3E25 Why does it have E?

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exam Other Question
the altitude drawn to the hypotenuse of a right triangle divides the hypotenuse into two segments, whose lengths are 8 inches and 18 inches. how long is the altitude???

thank you ! a+4(4)=a+4(a)