The signal from a certain satellite takes approximately 0.0078 seconds to reach Earth. Write this number in scientific notation. The total surface area of Africa is approximately ×1.17107 square miles. Write this number in standard notation.

Seconds:

Square miles:

7.8 x 10^(-3)

Step-by-step explanation:

Move the decimal so there in one non-zero digit to the left of the decimal point. The number of times the decimal point is moved will be the exponent to 10. If the decimal is being moved the right then the exponent will be negative. if the decimal is being moved to the left the exponent will be positive. Therefore, since 0.0078 is converted to 7.8 the decimal point was moved the right three times making the exponent -3.

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step-by-step explanation: