exam Maths Puzzle Numerical Ability

a+4(4)=a+4(a)

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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?
Evaluate the expression x4 − 9x2 + 4x + 8 for x = 0.Your Answer:
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Describe the graph o