**Answer:**

x =234567

**Step-by-step explanation:**

i took the test

Radius is equal to 1/2 the diameter. The radius is 14 (28/2=14)

With your formula:

c=2*14

c=28

HOWEVER I believe you meant

c=2(pi)r

In which

c=2(pi)14

c=28(pi)

In this instance for pi we can use 3.14 since we will be rounding anyway, so

c=28*3.14

c=87.92

Rounded to be

c=88

Note:

If we didn’t round pi out to 3.14 we would have gotten 87.964594...

It's too easy just to calculate the actual value:

726 × 5 = 726 × 10/2 = 7260/2 = **3630**

_____

You might estimate the value as 700 × 5 = 3500. You might estimate that to be low by 26/700 ≈ 4%, so about 140.

**Answer:**

6

**Step-by-step explanation:**

**Answer:**

16 + 10 ÷ 2

**Step-by-step explanation:**

We adding 16 to 10. So, 16 + 10. We then divide it by two. So, it is 16 + 10 2