**Answer:**

b= 69

**Step-by-step explanation:**

total inside angles = 900

because (7-2)*180 = 900

plus them all and set it = 900

you will get b= 69

A shape with 4 sides is a quadralateral

**Answer:**

I wish I could help

**Step-by-step explanation:**

I will try finding the answer

The probability is 2/3.

The probability of a sum greater than 5 given the first roll is 3 is given by

P(sum>5|first 3)=P(first 3 and sum>5)/P(first 3)

The probability of rolling a 3 first and having a sum > 5 is 4/36 = 1/9.

The probability of rolling a 3 first is 6/36 = 1/6.

1/9÷1/6 = 1/9×6/1 = 6/9 = 2/3