Answer:
let’s make a Unit rate.
$20/4 hours = $5 per hour
So you earn $5 in 1 hour if you earn $20 in 4 hours.
hope this helps and pls mark me brainliest if it did ;)
Answer:
20 mph and 4 mph
Step-by-step explanation:
GIVEN: A boat travels upstream for
miles in
hours and returns in
hours traveling downstream in a river.
TO FIND: What is the rate of the boat in still water and the rate of the current.
SOLUTION:
Let the speed of boat in still water be
and speed of current be
.
speed of water in upstream 
speed of water in downstream 
As 


Solving both we get


Hence speed of boat in still water and rate of current is 20mph and 4mph respectively.
Answer:
1307199.57
Step-by-step explanation:
Follow BEDMAS (brackets first, then exponents, then multiplication and division, then addition and subtraction)
587x6543÷285(32+65)
32+65=97
587 x 6543 ÷ 285 x 97
= 3840741 ÷ 285 x 97
= 13476.2842 x 97
= 1307199.57
Basically
just put the coeficinets of each variable in the apropriate row
example
ax+by=c and
dx+ey=f
would go in like this
![\left[\begin{array}{ccc}a&b&|c\\d&e&|f\end{array}\right]](https://tex.z-dn.net/?f=%20%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Da%26b%26%7Cc%5C%5Cd%26e%26%7Cf%5Cend%7Barray%7D%5Cright%5D%20)
so
3x+1=1 and
0x-1y=5
![\left[\begin{array}{ccc}3&1&|1\\0&-1&|5\end{array}\right]](https://tex.z-dn.net/?f=%20%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%261%26%7C1%5C%5C0%26-1%26%7C5%5Cend%7Barray%7D%5Cright%5D%20)
D is answer