PLEASE HELP! Multiply each equation by a number that produces opposite coefficients for x or y.
4.2 + 5y = 7
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X
3.x - 2y = -12
X

Find the value of the cosine for angle a

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?