X - number of 5 c stamps,
y - number of 15 c stamps,
z - number of 25 c stamps.
The system:
x + y + z = 160
y = 3 x
0.05 x + 0.15 y + 0.25 z = 25 / * 100
-------------------------------------------------
x + y + z = 160
y = 3 x
5 x + 15 y + 25 z = 2500 / : 5
----------------------------------------
x + 3 x + z = 160
x + 3 y + 5 z = 500
-------------------------
4 x + z = 160 / * ( - 1 )
10 x + 5 z = 500 / : 5
------------------------------
- 4 x - z = - 160
+
2 x + z = 100
-------------------------
- 2 x = - 160
x = 30, y = 90
z = 160 - 120 = 40
Answer:
- 30 of 5 c stamps,
- 90 of 15 c stamps,
- 40 of 25 c stamps.
If p, then q.
p = two lines intersect
q = they share a common point
If two lines intersect, then they share a common point.
Answer:
x= -8 x=1
Step-by-step explanation:
x^2+7x-8=0
Factor
What 2 numbers multiply to -8 and add to 7
8*-1 = -8
8+-1 = 7
(x+8) (x-1) =0
Using the zero product property
x+8 =0 x-1=0
x= -8 x=1
The expressions that result in a difference of 1/4 are; Choice C) 2\3 − 5\12 and Choice E) 1/2 − 1\4
For Choice A; 2\10 − 1\6
For Choice B; 3\4 − 1 4
For Choice C; 2/3 - 5/12
For Choice D;. 7\8 − 3\12
For Choice D; 1/2 − 1\4
In essence, the expressions that result in a difference of 1/4 are; Choice C) 2\3 − 5\12 and Choice E) 1/2 − 1\4
Read more;
brainly.com/question/10532785