exam Maths Puzzle Numerical Ability

FIND THE DOMAIN,RANGE,AND PERIOD OF THE FOLLOWING FUNCTIONS. PLEASE HELP I HAVE NO CLUE AND WE ARE SUPPOSED TO GRAPH IT ON A TI-82 CALCULATOR TO CHECK THE ANSWERS.

Y=2SIN(X-PI/4)

Y=-2SIN(PIX=PI)

Y=-COS(2X-PI)

Y=6COS(3X=PI/2)

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exam Other Question
A mixture of birdseed contains sunflower seeds worth $1.30 per kilogram and other seeds worth #0.90 per kilogram. How many kilograms of each kind must be used to produce 100 kilograms of mixture that sells $1.00 per kilogram? 12.Use the distributive property to write an equivalent variable expression.

2(z + 8)