Answer:
Option (2) [Graph on the top right]
Step-by-step explanation:
To find the temperature decrease by 0.5 degrees every hour we will find the slopes of the lines given in every option.
Option (1) [Top left graph]
Slope = 
= 
= -10
Option (2) [Top right]
Slope = 
= -0.5
Option (3) [Bottom left]
Slope = 
= -1
Option (4) [Bottom right]
Slope = 
= -12
Therefore, Graph given in option (2) will represent the decrease in temperature by 0.5 degrees per hour.
Answer:
120 inches long in total becuase 12x10 is 120.
Y=3x+4 is the line parallel to y=3x+5
You'll have to solve simultaneously
let nickel be x, dime be y
x + y = 35 ... ( 1 )
5x + 10 y = 250
5 ( x + 2y ) = 250
x + 2y = 50 ... ( 2 )
in ( 1 )
x = 35 - y ( 3 )
sub ( 3 ) into ( 2 )
( 35 - y ) + 2y = 50
y = 15
sub y into ( 1 )
x + y = 35
x + 15 = 35
x = 20
therefore, Sandy has 20 nickels and 15 dimes