Math Answers

Rene scored at the 65th percentile on a test given to 12,600 students. How many students scored higher than Rene?

Student in a highschool can choose to study spanish and french as a foriegn language.In a given academic year, 90%of pupils choose spanish and the rest choose french.30%of the student who are learning spanish are boys and 40% of who are studying french also boy. If student was randomly selected from this academic year, What is the probability that it would be

a) a girl?

b) What is the probablity selected boy student given that spanish language study?

c) A boy?

d) what is the probability that a randomly selected student is a boy or somebody who studies french?

e) whay is the probability that randomly selected student is girl who does not study french?

1.  An archeologist found the remains of an ancient wheel, which she then placed on a grid. If an arc of the wheel passes through A(-7,0), B(-3,4) and C(7,0), located the center of the wheel, and the standard equation of the circle defining its boundary. 

If one bag of adhesive cement for brick paves can cover 10sq. m how many bags of adhesive cement will be needed

The edge of the cube can be expressed by the formula s=, where V is the volume of a cube. If the volume of a cube is 375 m, what is the edge of cube?

Show that the series , ∞Σ n=1 (x/1+n^2x^2) is uniformly convergent in [ k,1] for any k>0.

Give an example of an infinite set with finite number of limit points, with proper justification.

3.)If we know the values of the sine and cosine of a and b, we can find the value of sin(A+B) by using the ____formula for sine. State the formula :

Sine(A+B)

4.)if we know the values of the sine and cosine A ana B, we can find the value of cos (A-B) by using the ____ formula for cosine. State the formula :

Cos(A-B)

5.)if we know the values of sin x and cos x, we can find the value of sin 2x by using the ____formula for sine. State the formula :sin 2x =____

6.)if we know the value of cos x and the quadrant in which x/2 lies, we can find the value of sin(x/2) by using the _____ formula for sine. State the formula:

Sin(x/2)=______

2x square + y square+z square +4 yz +2 xy-2 xx

Solve the equation :

(7y-3x+3) dy +(3y-7x+7) dx=0