Answer:
1. x=11/4
Step-by-step explanation:

u should x 20 then u will get





Try this solution with short explanation; note, the suggested way is not the shortest one; the answers are marked with red colour.
Task no. 2: another solution is 45* (4/5) / (6/4) = 24 min.
0.19 for one cookie and 0.59 for one doughnut
x for how much one cookie costs and y for how much one doughnut costs
6x+4y=3.5
12x+5y=5.23
solve by substitution: (elimination would work too)
4y=3.5-6x
y=0.875-1.5x
12x+5(0.875-1.5x)=5.23
12x+4.375x-7.5x=5.23
4.5x=0.855
x=0.19
now use x to solve for y:
6(0.19)+4y=3.5
1.14+4y=3.5
2.36=4y
y=0.59
Check the work: 6(0.19)+4(0.59)=3.5
To solve this, we divide 48 by 3.
48÷3=16
16 blocks per hour.
Answer:
The option that no represent a linear function is 
Step-by-step explanation:
we know that
The graph of a linear function is a straight line
The equation of a linear function in slope intercept form is equal to

where
m is the slope
b is the y-intercept
<u><em>Verify each case</em></u>
option 1) we have

This option represent a linear function
where
m=3
b=-2
option 2) we have

This option represent a linear function
where
m=1
b=0
This option represent a linear direct variation function
option 3) we have

This option not represent a linear function
This option represent a exponential function
option 4) we have

This option represent a linear function
where
m=3
b=0
This option represent a linear direct variation function