4. The recommended heart rate for weight management exercise and improving cardio fitness, in beats per minute, depends on a person's age
and can be represented by the expression 0.7(220 - a).

Part A: What does the variable in the expression represent?

Part B: Rewrite the expression using the distributive property.

Part C: what is the recommended heart rate for a 20-year-old person?

Part A: a=Age

Part B:

0.7 by 220

0.7 by a

then subtract the products

Part C: 140bpm

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.

step-by-step explanation:

where is the question is there is a formula or is there not one