**Answer:**

D. 15 x (1 + 2)

**Step-by-step explanation:**

answer A and B have the common factor of 5, meanwhile answer C has the common factor of 2.

**Answer: 13/12**

**Step-by-step explanation:**

Reduce the fraction 3/9 to the lowest terms by extracting and canceling out 3.

The least common multiple of 4 and 3 is 12. Convert 3/4 and 1/3 to fractions with denominator 12.

Since 9/12 and 4/12 have the same denominator, add them by adding their numerators.

Add 9 and 4 to get 13.

**Answer:**

30,60,90 triangle, which is the lengths 1 √
3
, and 2
respectively. This is what I have got so far: Using the 30-60-90 Ratio

**Step-by-step explanation:**

If we substitute 2 into x it'll be:

**Answer:**

506.7 cm²

**Step-by-step explanation:**

The amount of cardboard needed would be the surface area of the cone,

S= pi(r)(l+r) where r is the radius and l is the slant height.

You can find l using the Pythagorean theorem. l²=r²+h² which is l²=6²+20² and you get l = √436.

Plug r and l into the equation: S = 6pi(√436 + 6) = 506.7 cm²

Let me know if you have any questions about my steps!