Is cd a commutative property

Answers

Answer 1

Answer: Would assume cd means c*d

c*d is commutative because:

c*d = d*c

The result in multiplication is the same, irrespective of which comes first.

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Can someone help me with these questions I will put 25 points if you help me please ASAP
Solve the proportion of x. 6/10=9x

Suppose a railroad rail is 3 kilometers and it expands on a hot day by 15 centimeters in length. Approximately how many meters would the center of the rail rise above the ground?

Answers

Answer:

The center of the rail rise above the ground is:

15 meter.

Step-by-step explanation:

As the railroad on expansion will form a right isosceles triangle.

The railroad is 3 km=3000 m before expansion.

It expanded by 15 cm.

This means that in meters it expanded by 0.15 m

Hence, the railroad after expansion it is: 3000.15 m

Now we need to calculate the hypotenuse of the right triangle in order to find the center of the rail rise above the ground.

and hence it is calculated as:

$=(1)/(2)* √((3000.15)^2-(3000)^2)\n\n\n=(1)/(2)* 30.000374977=15.000187$

which in meters is approximately given by:

15 meters.

3km =m 3 x 1000m = 3 x 10 ^3m

expansion = 3x 10^3m + 15 x 10 cm

Use the system of equations. Please show your steps and how you solved it!3x+3y=15
3x=6y=-12

Please Help!

Answers

1. 3x+3y=15
-3y = -3y (subtract 3y from both sides)
3x = 15-3y
----------------------
3 = 3 3 (divide each number by 3)
x = 5- y

Which are names of points drawn in the figure?Choose all answers that are correct.

A.
k

B.
C

C.
P

D.
t

Answers

i think the answer is c but let me look it up

A total of four x is less an or equal to 8

Answers

The answer is simple. First you subtract 4 from each side to get xis lesss than or equal to 4

What is the approximate area of the shaded region? A.
104.86 cm²

B.
87.47 cm²

C.
27.02 cm²

D.
10.54 cm²

Answers

7 x 7 = 49 area of square.

The radius of the circle is half the diameter. 7 cm/2 = 3.5

A = 3.14 × 3.5 cm × 3.5 cm = 38.465

Finale step. Subtract the area of the circle from the area of the square.

49 cm^2 −38.465 cm^2 = 10.535 or round to 10.54 cm^2

D. 10.54

Give three solutions of the inequality
6 − 11x < 61

Answers

Any positive number can be substituted as x to solve the inequality.
Ex. 6-11x, x=5, 6-11(5)= 6-55, which is -49. 61 is greater than -49. Substitute any other positive numbers and they will work also.

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What is the value of x in the equation -6x=5x+22?

Carl and Rita ate breakfast at the local diner. Their bill came to $11.48. They gave their waitress a tip that was 25% of the bill. How much money did they give the waitress for her tip?