Answer:
A)
Step-by-step explanation:
To find the answer we must solve each of the systems separately. Starting with the first one:
x + y = 2
2x - y = 10
We must find what x or y is equal to and then replace it in the second equation. I'll go with y as it seems easier:
x + y = 2
y = 2 - x
Now that we found y we replace it in the second equation this way. Be careful with the signs, the minus with change our signs:
2x - (2 - x) = 10
2x - 2 + x = 10
3x = 12
x = 12/3
x = 4
Now that we have x, we replace the variable with its value in one of the equations. Again, for simplicity I'll go with the one that seems easier.
4 + y = 2
y = 2 - 4
y = - 2
Hello!!
Well, there are 60 seconds in a minute, so all we have to do is multiply by 60.
13 * 60 = 780
The jogger runs a mile in 780 seconds.
Hope this helps!!
Answer:
B
Step-by-step explanation:
3600/30/16=15/2=7 1/2
Answer:
3
Step-by-step explanation:
If this isn't a trick question then the answer is 3.
Number of girls : number of boys = 28 : 18
28 : 18 = 14 : 9,
so
number of girls : number of boys = 14 : 9
Answer E. 14/9
