trig
Prove: sin(x–y)sin(x+y)=sin^2(x)–sin^2(y)
Chemistry
Given the following equation: Na2O + H2O ---> 2 NaOH. How many grams of NaOH is produced from 1.20 x 10^2 grams of Na2O? How many grams of NaO2 are required to produce 1.60 x 10^2 grams of NaOH?
chemistry
A plastic container with a mass of 30 grams gains 1,140 joules of heat. If the temperature of the container increases 20°C, what is the specific heat of the plastic in the container?
smu
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the mean crash damages the same for...
SMU
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard dev...
Trig
In ABC, vertex C is a right angle. Which trigonometric ratio has the same trigonometric value as Sin A? A Sin B B Cosine A C Cosine B D Tan A
Trig
Which trigonometric function can equal or be greater than 1.000? A Sine B Cosine C Tangent D none of the above
Chemistry (PLEASE HELP ME)
the answer in number 1 is b
calculus
What is the length of the blue line labeled r in the image below? Give your answer in terms of a and b. blue line labeled r starting at the origin and ending at a point a,b b|------------| | /| | / | | / | | / | | / | | r / | | / | | / | | / | | / | | / | _|____________|a
MATH
how do you wite an equation for the function in a problem like 4x+y=-10?
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