Mathematics

Grade 12 vectors: scalar projection

The magnitude of the scalar projection of (1, m, 0) on (2, 2, 1) is 4. Determine the value of m. Answer: 5 or -7. I got 5 as my answer.How can it possibly be -7 as well?-The tricky word is magnitude.

Using Law of Cosines find the indicated angle theta

a = 68.01 b = 37.83 c = 42.15 Angle B = theta I have tried many times. How do I solve this one?-b^2 = a^2 + c^2 - 2abcos(B) Substituting the values in: (37.08)^2 = (68.01)^2 + (42.15)^2 - 2(68.01)

The solution of sin 2x = 0 , - π <= x <= π is

0 ,π/2,π,-π,-π/2-42

Katie had an unpaid balance of $1,734.50 on her credit card statement at the beginning of January. She made a

Katie had an unpaid balance of $1,734.50 on her credit card statement at the beginning of January. She made a payment of $165.00 during the month. If the interest rate on Katies credit card was 7% per

Solve each equation by completing the square

1. y²- 2y = 15 2. x²- x - 5/3 = 0 3. 4x²+ 12x - 7 = 0 4. The time t in seconds for a car to skid 12 feet is given by12 = -12t + 9t² Use any method to solve for t. (Choose the answer that is reasona

The solution of cos ( x + π ) = -1 , -2π <= x <= 0 is

Ans x = 0 x = -2 pi-cos is X/r == -1 on negative x axis, or theta = -PIso -PI = x+PI; x== -2PI

DID I DO THIS MATH QUESTION RIGHT? Find the follwing limits or state that thelimit does not exist. Thank you

1. Limit n--> infinity ( 2- (1/n) + (3/n^2) i got this to be 2 2. Limit n--> infinity (1+2n)/ (1-3n) i got this to be one 3. liminit n--> infnity of (1.1)^ n im not sure what this is, please help 4. L

How do you solve: (7.6 * 10^46)^3

this is HARD math homework, please help :\-(7.6 * 10^46)^3 7.6^3 * (10^46)^3 438.976 * 10^138 4.38976 * 10^140 -PEMDAS is what you need to know.It stands for parentheses, exponents, multiplication and

X=sqrt(-3x+40)? Please solve

Square the equation. The absolute value is just since the -3x+40 part could be either negative or positive: X^2=|-3x+40| Now you have two options left: X^2-3x+40=0 OR X^2+3x-40=0 You can use quadrat

What would this average out to

for this semester I received two Ds and a B on my tests. if I receive an A or B on my final, what can the total ending grade possibly be?-Depends on your teachers grading policy. If everything is equ

Algebra Word Problem

The State University Landscape Club wants to establish a horticultural garden near the adminstration building. The length and width of the space that is available are consecutive even integers, and th

I have a question on probability

Let z be a random variable with a standard normal distribution. Find the indicated probability. (Round your answer to four decimal places.) P(−0.86 ≤ z ≤ 0)= Let z be a random variable with a standar

Question with an algebra word problem

After Gracie launches her model rocket, the height of the rocket can be modeled by the equation h(t)= -16t^2+360t where h(t) is the height of the rocket in feet and t is the time in seconds A. How hi

Statistics Homework Help

A population variable has a distribution with mean 50 and standard deviation 15. From this population a simple random sample of n observations is to be selected and the meanof the sample values calcul

How come 10x + y - (x+y) = 9x

Hi Guys, I cant remember my school maths and am trying to work out how come 10x + y - (x+y) = 9x. I know this is very basic but can you pls give me a step by step breakdown? tnx!-Sure. 10x + y -