The lines shown below are parallel. If the green line has a slope of -2, what is the slope of the red line?
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What is sin 7x/4 ? i need on this urgent trig

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is