arithmetic
What did he start with ? What is meant by ?<3 at the end of your post ?
math
Did you mean the monthly interest charge? I will assume that Charge = 5000(.165)/12 = ... do the same for #2
math
V = (4/3)πr^3 = (4/3)π(20^3) = ....
URGENT~MATH For Steve or Reiny
#5 is correct #6 2x - 1 = x+3 x = 4 , y = 7 looks like A) #7 4x = 5-x 5x=5 x=1 , y = 4 looks like B) You should have checked each of your answers by simply subbing your answer. It must satisfy BOTH equations
math
I will assume you simply typed y = 5 twice. Please confirm before I start this question, which looks rather messy.
math
number of chickens --- x number of cows ------- y number of birds -------50-x-y .5x + 2.5y + 5(50-x-y) = 50 times 10 5x + 25y + 50(50-x-y) = 500 5x + 25y + 2500 - 50x - 50y = 500 -45x -25y = -2000 9x + 5y = 400 we need integer solutions , where both x and y must be between 0 a...
math
Since the prob of anything has to be a number between 0 and 1 inclusive, an answer of 120% which would be 1.2 is totally illogical
Trig
let tan^-1 (3/4) = A and let cos^-1 (9/41) = B then cos[(tan^-1(3/4))+(cos^-1(9/41))] = cos(A + B) = cosA cosB - sinA sinB IF tan^-1 (3/4) = A then tanA = 3/4 ---> sinA = 3/5 and cosA = 4/5, recognize the 3-4-5 right angled triangle if cos^-1 (9/41) = B then cosB = 9/41 ---...
parabolas
The distance between the vertex and the focus is 3 so the directrix must be x =2 (from -1 to 2 is 3) let (x,y) be any point on our parabola √( (x+4)^2 + y^2) = √( (x-2)^2 + 0) square both sides and expand x^2 + 8x + 16 + y^2 = x^2 - 4x + 4 y^2 = -12x - 12
algebra
(-12a^2b^6)^3 / (9a^3b^9)^3 = ( (-12a^2b^6)/(9a^3b^9) )^3 = ( (-4/3)(1/a)(1/b^3) )^3 = (-64/27)(1/a^3)(1/b^9) = -64/( 27a^3b^9 )
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