Select the correct answer. What is the value of this expression when c = -4 and d = 10?
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Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.