exam Maths Puzzle Numerical Ability

12.Use the distributive property to write an equivalent variable expression.

2(z + 8)

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exam Other Question

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) okay. today my teacher went over this, but I still do not understand it. She said to do something like a scale in science "whatever you do to this side, do to the other." but i still dont get it. HELP!!!