Answer: 
Step-by-step explanation:
Let be "x" the amount of miles light will travel in 4,200,000 seconds.
Rewrite 4,200,000 seconds in Scientific notation. Move the decimal point 6 places to the left. Then:
According to the exercise, light travels 
miles in 1 second.
Therefore, based on this data, you can set up the following proportion:
And finally, you must solve for "x" in order to find its value.
(Remember the Product of powers property: 
)
Then:
Answer:
1/27000
Step-by-step explanation:
= 3^-3 × 10^-3
= 1/3³ × 1/10³
= 1/27 × 1/1000
= 1/27000
Hope this helped!
Diagonal of a Rhombus are perpendicular & intersects in their middle point:
Assume the diagonals intersects in H
A(0,-8), B(1,-0), C(8,-4) & D(x, y) are the vertices of the rhombus and we have to calculate D(x, y)
Consider the diagonal AC. Find the coordinate (x₁, y₁) H, the middle of AC
Coordinate (x₁, y₁) of H, middle of A(0,-8), C(8,-4)
x₁ (0+8)/2 & y₁=(-8-4)/2 ==> H(4, -6)
Now let's calculate again the coordinate of H, middle of the diagonal BD
B(1,-0), D(x, y)
x value = (1+x)/2 & y value=(y+0)/2 ==> x= (1+x)/2 & y=y/2
(1+x)/2 & y/2 are the coordinate of the center H, already calculated, then:
H(4, -6) = [(1+x)/2 , y/2]==>(1+x)/2 =4 ==> x=7 & y/2 = -6 ==> y= -12
Hence the coordinates of the 4th vertex D(7, -12)
To get the answer, all you have to do is plug in 1 into the equation.
So, it would be -2(1) - 2 -> -2 -2 -> -4
The answer is -4
Hope this helps!
The answer should be A.
basically, what i did was first find out what number the scientific notation equaled. because the exponent over 10 is negative, that means the decimal in the 9.9 will move 2 spaces to the right leaving us with a total of 0.099. Then, i saw what whether the rate would be in feet or inches.
first using feet i realized that because we have to see whether the rate is daily or monthly, we would have to divide this number (3) by 365 or 12. 3 divided by 365 is 0.008 which is nowhere near 0.099 (the number we want). 3 divided by 12 is 0.25 which is also not the number we want. so basically the answers cant be c or d because we wont be using feet in our rate.
as for inches, there are 36 inches in 3 feet (the total erosion rate per year). now we must see whether it is daily or monthly. 36 divided by 12 (months) is 3 which is not the number we want so basically 36 divided by 365 is 0.099.
hope that made sense
