-4 and -5
because to get 16 to 12 you have to subtract 4 but it wants you to add so you put a negative sign infront of it.

and a negative multiply by a negative equals a positive so -3×-5=15

5 0

3 years ago

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Evaluate cot(-405°) I need help please

LuckyWell [14K]

$x^\circ = x^\circ +360n$
where n is a whole number

$cot (\theta) = \frac{1}{tan(\theta)}$

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3 years ago

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I need help with this problem and show your work plz thanks

coldgirl [10]

Well is just their sum, thus

$\bf \cfrac{3}{4}+\cfrac{2}{3}\impliedby \stackrel{LCD~is}{12}\implies \cfrac{(3)3+(4)2}{12}\implies \cfrac{9+8}{12}\implies \cfrac{17}{12}\implies 1\frac{5}{12}$

5 0

3 years ago