Work out the answers to:
a) 4-7
b) (-3) + 8
c) 9-11
d) (-2) -4

-3, 5, -2, and 2

Step-by-step explanation:

4-7 is like 7-4 and the answer you get you add a negative sign

-3+8. On a number line its 5, you move to the right because its adding, and get 5.

9-11, again on a number line, this time move to the left, because subtraction, and get -2

-2-(-4). On a number line, start at -2. Move 4 to the left, subtraction, and get -6

right

step-by-step explanation:

answer: the price of one pound cabbage = $ 0.8

the point (10,8) represents that the cost of 10 pounds cabbage is $ 8

step-by-step explanation:

since, here is a proportional relation between the number of pounds of cabbage (x) and the price in dollars (y).

therefore, we can write,

⇒ y = k x

where k is the constant of proportionality.

now, point (5,4) is in the line.

thus, it will satisfies the above equation of line.

⇒ 4 = 5 k

⇒ k = 0.8

thus, the equation of the line is,

y = 0.8 x

a) for x = 1,

y = 0.8

therefore, the cost of one pound of cabbage is 0.8 dollars.

b) in the below graph (10,8) represents that the cost of 10 pounds of cabbage is 8 dollars.