**Answer:**

2-packs of candy bars for 0.38 is better to buy

**Step-by-step explanation:**

**Answer:**

**total cost is $2444**

**Step-by-step explanation:**

A company’s marginal cost function is where x is the number of units

Marginal cost function is the derivative of cost function

to find the total cost of producing units , take integral of marginal cost function

with intervals 144 to 625

now plug in the values

**total cost is $2444**

**Answer:**

The ones that give a rational number answer are:

C+D

A*B

C*D

A*A

**Step-by-step explanation:**

A+B does not give a rational number answer; √3+2√3 = 3√3

C+D is a rational number; √25=5 and √16=4; 5+4=9.

A+D is not a rational number; √3+√16 = √3+4

A*B is a rational number; √3*2√3 = 2√9 = 2*3 = 6

B*D is not a rational number; 2√3*√16 = 2√3*4 = 8√3

C*D is a rational number; √25*√16 = 5*4 = 20

A*A is a rational number; √3*√3 = √9 = 3

45 ft^2 is the surface area