Mathematics

X is the lower number when two dice are rolled. Calculate the expected value of X.

How do you do this?-Possible Outcomes Of Throwing Dice 1 1Result: 1 1 2Result: 1 1 3Result: 1 1 4Result: 1 1 5Result: 1 1 6Result: 1 2 1Result: 1 2 2Result: 2 2 3Result: 2 2 4Result: 2 2 5Result: 2

3-2(-1)^3 + (-3)(4) best answer

I keep getting -12 but its wrong. Can anyone remember the order of operations here? thanks)-1)3-[2(-1)^3] =3-[2(-1)] =3-(-2) =3+2 =5 2)(-3)X4 = -12 3)5 + [-12] = 5 -12 = -7-Dude use parenthesis, alw

What Is The Answer To 8(x+2)=6x

Distribute then combine like terms-8x+16=6x 16=-2x -8=x-8(x+2) = 6x = (8*x + 8*2) = 6x = 8x + 16 = 6x = 16 = 6x - 8x = 16 = -2x = 16/-2 = x Therefore x = -8.

Statistics and Probability question

Let X be a random variable. By expanding the expression E(X^2-E(X))^2 show that E(X^2) > (E(X))^2.-Are you sure that you are expending E(X^2-E(X))^2 and not E(X - E(X))^2 ? note that 0 E(X^2) - 2(E(X)

What number is this, how do you say it

How do you say this number? 317,438,990,000,000,000,000-Three hundred and seventeen quintillion four hundred and thirty eight quadrillion nine hundred and ninety trillion.-However--at least in the St

How would I solve this inequality

2x/3 Would I multiply both sides by 3?-2x/3 Yes multiply by 3(which is positive so inequality does not change 2x Now divide by 2(which is positive so inequality does not change x-You could do that to

Trig. sum difference help

{sin(π-a) + sin(π/2 -a)}² = {(sin(π)cos(a) - cos(π)sin(a)) + (sin(π/2)cos(a) - cos(π/2)sin(a))}² = {(0*cos(a) - (-1)sin(a)) + (1*cos(a) - 0*sin(a))}² = (sin(a) + cos(a))² The third line, the sin(pi)

Help with three math questions please!

Which is an equivalent form of 12 over 15? A: 1, 1 over 4 B: 24 over 30 C: 4 over 7 D: 36 over 39 A line passes through the point (4, -1) and has a slope of 3 over 2. If you use this slope to generat

Maths Answer+Method - What is the fewest number of gold coins that cold have been present in the sack

Seventeen Mongolian Raiders stole a sack of gold coins. After diving the spoils evenly, three coins remained. A scuffle ensued as to who would get each of the additional coins. As a result, one of the

A card drawing probability problem.

You have a deck of 52 cards. What is the probability of choosing a club or a heart? Enter your answer in simplified fraction form; example: 3/5. How to do it?-there are 13 clubs, and 13 hearts. Thus

What equation is this y=a(x-h)^2+k ? 10 pts

It is a quadratic equation in the vertex form!!! so its vertex would be (h,k)-y-k=a(x-h)^2 let Y=y-k & X=x-h the eqn. becomes Y=A (X)^2 which is parabola-standard equation for a parabola a= determ

What would 33% get me off a 16$ CD

I have a 33% off coupon and am wondering How much a 16$ CD would cost if I get 33%.-- $5.28-saving = 16 * 0.33 = $5.28. it will cost you (16 - 5.28) = $10.72-It would cost you $10.56Saving you $5.44-y

Linear algebra help.. FORM basis of R3

Here is the problem:- http://s2.postimage.org/ml73w3leq/Vector… Can someone help me out with that problem? Thanks a lot-So what we want to know is whether these vectors span R^3. In other words, can

What in degrees is Inverse Sin (-1/2)

Because its sin and its negative I know its not on the top two quadrants. How can I tell if its either in quadrant three or quadrant 4? If its in quadrant 3 then its -90 degrees and if its quadrant 4

Factorise 20a+30a^2 maths

I dont see any two factor pairs of 30 that add to give 20, I suppose its something to do with squaring outside of a bracket but I dont know how, any help please, Thanks.-1. Factor the expression by 10