Jill bought a lamp for $40. She sold it at a garage sale for $12. What was the approximate decrease?
1 answer:
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The point-slope form:
We have the points (-8, -8) and (-7, 9). Substitute to the formula of a slope:
Put the coordinates of the point (-7, 9) and the value of slope to the point-slope formula:
To solve this equation, start by noticing that you want to find t when P is 75%, or 0.75. Plug in 0.75 for P. Please see the attached screenshot for a step-by-step. The correct answer is 29.496 days.
EDIT 2: I actually was correct! You check the answer by substituting 29.496 for t in the original equation set equal to 0.75. It is 0.75. I had forgotten the negative sign when I checked.
EDIT 2: I actually was correct! You check the answer by substituting 29.496 for t in the original equation set equal to 0.75. It is 0.75. I had forgotten the negative sign when I checked.