Answer:
The cost of each book is $18.
Step-by-step explanation:
1. 12.50+2n=48.50
2, 12.50-12.50=cancels out
3. 48.50-12.50=36
4. 2n=36
5. 2n/2=n
6. 36/2=18
7. n=18
Answer:
x= -5
y= -2
Step-by-step explanation:
From the equation y=x+3-------eqn 1
x+y= -7-------eqn2
x+(x+3)= -7 (since there is no value before the bracket is 1, so multiply by 1)
x+x+3= -7
2x+3=-7
2x=-7-3
2x=-10
x=-10/2
x=-5
Insert x value in equation 1
y= -5+3
y=-2
Answer:
the last answer
Step-by-step explanation:
Answer:
B.45
Step-by-step explanation:
<h3>A sum of all angles in a triangle is 180°</h3><h3>55+60+x+20=180</h3>
60+55=115
180-115=65
65-20=45
Answer: 45°
I think it’s the second one because The formula would be
x=
2a
−b±
b
2
−4ac