Answer:
Seb will take 13 minutes and 20 seconds to run 4000 m at an average speed of 5 m/s
Step-by-step explanation:
time taken = distance / speed
time taken = 4000/5
time taken = 800 seconds
time taken = 13 minutes and 20 seconds
Linear equations are all solved the same way. Figure out the operations performed on the variable. Undo those in reverse order.
Here, the variable is
- divided by 2
- has -7 added.
In reverse order, we undo these operations by
- adding 7
- multiplying by 2.
Whatever we do to one side of an equation, we must also do to the other side. That is how the equal sign remains valid.
2 = m/2 -7
2 +7 = m/2 -7 +7 . . . . . add 7
9 = m/2 . . . . . . . . . . . . simplify
2*9 = 2*m/2 . . . . . . . . multiply by 2
18 = m . . . . . . . . . . . . . simplify. (You know that 2/2 = 1, and m*1 = m.)
The answer is m = 18.
_____
Check:
.. 2 = 18/2 -7
.. 2 = 9 -7 . . . . . . . true. The answer checks OK.
Just write 5-8i and then replace the - sign with the + sign: 5+8i.
Answer:
The surface area of the sphere is about 
Step-by-step explanation:
step 1
Find the radius of the circumference
The circumference of a circle is equal to
we have
substitute and solve for r
![r=552.64/[2(3.14)]=88\ yd](https://tex.z-dn.net/?f=r%3D552.64%2F%5B2%283.14%29%5D%3D88%5C%20yd)
step 2
Find the surface area of the sphere
The surface area of the sphere is equal to
we have
substitute
