Answer:
D) Multiply A by -4 and B by 5
Step-by-step explanation:
5x-2y=10
4x+3y=7
----------------
-4(5x-2y)=-4(10)
5(4x+3y)=5(7)
----------------------
-20x+8y=-40
20x+15y=35
---------------------
23y=-5
y=-5/23
5x-2(-5/23)=10
5x+10/23=10
5x=10-10/23
5x=230/23-10/23
5x=220/23
x=(220/23)/5
x=(220/23)(1/5)
x=220/115
x=44/23
Answer:
Step-by-step explanation:
5.55
Answer:
89.125%
Step-by-step explanation:
The weighted mean is simply the multiplication of the number of student in each period times the respective average of said period, divided by the total number of students:
Average = 
= 89.125%
For the first shipment, 5r+4h=62.
For the second shipment, 10r+3h=84.
pick either equation and solve for r, them plug this back into the other equation and solve for h, you should then be able to find the price per harmonica and per recorder. Comment if you need more help.
Answer:
Step-by-step explanation:
- 1/2(2n + 4) + 6= - 9 +4 (2n + 1)
If you can describe this as well as you have, you should be using Latex which is at the bottom of your editor when you ask the question
Remove the brackets.
-1/2 * 2n - 1/2 * 4 + 6 = - 9 + 8n + 4 Combine like terms.
-n - 2 + 6 = -9 + 8n + 4
-n + 4 = - 5 + 8n Add n from both sides.
4 = -5 + 8n + n
4 = -5 + 9n Add 5 to both sides
4 + 5 = 9n
9 = 9n Divide by 9
9/9 = 9n/9
n = 1
