Find the EXACT value of cos(A+B) if sinA=−8/17 where A is in Quadrant III and sec B =−5/4 where B is in Quadrant II. Assume all angles are measured from standard position. cos(A+B) =

we know that angle A is in the III Quadrant, where sine is negative and cosine is negative.

we also know that angle B is in the II Quadrant, where sine is positive and cosine is negative.

the hypotenuse is never negative, since it's simply a radius length, so in a fraction, the hypotenuse will be the positive value.

three-fourths of an hour

36÷48=0.75

0.75=

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: