On a spinner p(3) =1/3 and the P(4)=2/5 What is the probabilty of getting a 3 or 4

Answers

Answer 1
Answer: p(3)+p(4)
1/3+2/5= 11/15


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SHOW THAT THE ANGEL BETWEEN ANY 2 DIAGONALS OF A CUBE IS cos-1 (1/3)

Answers

Look\ at\ the\ picture.\n\n|BD|=a\sqrt2\n\n|BD_1|=|DB_1|=a\sqrt3\n\n|BE|=|DE|=(a\sqrt3)/(2)\n\nUse\ law\ of\ cosine:\n\n(a\sqrt2)^2=\left((a\sqrt3)/(2)\right)^2+\left((a\sqrt3)/(2)\right)^2-2\cdot(a\sqrt3)/(2)\cdot(a\sqrt3)/(2)\cdot cos\theta\n\n2a^2=(3a^2)/(4)+(3a^2)/(4)-(3a^2)/(2)cos\theta

(3a^2)/(2)cos\theta=(6a^2)/(4)-2a^2\n\n(3a^2)/(2)cos\theta=(6a^2)/(4)-(8a^2)/(4)\n\n(3a^2)/(2)cos\theta=-(2a^2)/(4)\n\n(3a^2)/(2)cos\theta=-(a^2)/(2)\ \ \ \ \ /\cdot(2)/(3a^2)\n\ncos\theta=-(1)/(3)
Vector for one diagnol (1,1,1) - (0,0,0) = (1,1,1)
Vector for another diagnol (0,1,1) - (1,0,0) = (-1,1,1)

Do cos product of two vectors , that is 

sqrt(3) sqrt(3) cos(theta) = (1,1,1).(-1,1,1)
3cos(theta) = 1.(-1) + 1.(1) + 1.(1) = 1

therefore cos(theta) = 1/3
    angle betwwen diagnols = cos-1 (1/3) 

When the point (-3,2) is reflected across the y-axis, what are the coordinates of the resulting point?

Answers

A reflection across the Y-axis means that the Coordinate's X-value switches signs and the Y-value stays the same.  So in the case of (-3,2)
being reflected across the y-axis that means that -3 flips its sign and becomes a normal 3 and the 2 stays the same.  Therefore the new coordinate is (3,2)

I need help on everything on 45 45 90 right triangles. I dont know how to solve two variables when one is shown.

Answers

you can use a square plus b square equal C square to fijd each length . or you can memorize the special triangles or you can also do proportional problem. it all works

Select all of the true statements. A. 3 gallons = 18 pints B. 5 quarts = 20 cups C. 6 gallons = 30 quarts D. 2 pints = 32 fluid ounces E. 8 pints = 24 cups

Answers

Answer:

b

d

Step-by-step explanation:

1 gallon = 8 pint

3 x 8 = 24 pints

the first option is wrong

1 quart = 4 cups

5 x 4 = 20 cups

the second option is correct

1 gallon = 4 quarts

6 x 4 = 24

the third option is wrong

1 pint = 16 ounces

2 x 16 = 32 ounces

the fourth option is correct

1 pint = 2 cups

8 x 2 = 16 cups

the fifth option is wrong

Solve for the variable-6a+3=-3(2a-1)

Can some one help me. But explain in step by step?

Answers

Step 1: -6a + 3 = -3(2a - 1)
Step 2: -6a + 3 = -3(2a) + 3(1)
Step 3: -6a + 3 = -6a + 3
Step 4:+6a         +6a
Step 5:          3 = 3

The variable of x is equal to Any infinite number.

When constructing parallel lines with a compass and straightedge, how should you start the construction?

Answers

that would build a line parallel to and passing through a given point outside the line. Building a straight line passing through the given point perpendicular to the given line. Then build a straight line passing through the given point perpendicular constructed perpendicular. Obtained in this direct and will be required.

Answer:

You should start the construction by creating a line that intersects the given line with your straightedge.

Step-by-step explanation:

You should start the construction by creating a line that intersects the given line with your straightedge.