Answer:
B and E
Step-by-step explanation:
A. 8x = 2
8(4) = 2
32 = 2
B. 19 + x = 23
19 + 4 = 23
23 = 23
C. 40/x = 5
40/4 = 5
10 = 5
D. -3x = 12
-3(4) = 12
-12 = 12
E. x - x - x - x = -8
4 - 4 - 4 - 4 = -8
0 - 4 - 4 = -8
-4 - 4 = -8
-4 + (-4) = -8
-8 = -8
Answer:
Step-by-step explanation:
(d + 5) + (d + 5) + (d + 5).....combine like terms
3d + 15 <===
Answer:
4.91
Step-by-step explanation:
4¹/6*2¹/5
25/6*11/5
275/30
4.91
5
Answer:
parallel:
![7x - 8y = 60](https://tex.z-dn.net/?f=7x%20-%208y%20%3D%2060)
perpendicular:
![8x + 7y = 4](https://tex.z-dn.net/?f=8x%20%2B%207y%20%3D%204)
Step-by-step explanation:
original line:
-7x + 8y = 4
m = 7/8
parallel:
m = 7/8
L: 7x - 8y = k
(4, -4) -> L
28 + 32 = 60 = k
L: 7x - 8y = 60
perpendicular:
m = -8/7
L: -8x + 7y = k
(4, -4) -> L
-32 + 28 = -4 = k
L: -8x -7y = -4
=> 8x + 7y = 4
It is equal because every 2000 pounds is 1 ton and 18000lb divided by 2000 equals 9.