**Answer:**

15.19 cm

**Step-by-step explanation:**

**Answer: 2n^2. let me know if you need the explanation :).**

**Step-by-step explanation:**

**Answer:**

Angles that are congruent are complementary to the same angle

**Step-by-step explanation:**

see that attached figure to better understand the problem

we know that

Two angles are complementary if their sum is equal to

-----> equation A

so

-----> equation B

so

-----> equation C

Substitute equation A in equation C

So

That means------> angles ∠KLC and ∠KJC------> are complementary angles

therefore

the answer is

Angles that are congruent are complementary to the same angle

**Answer:**

a. There were 24 cups, 48 plates, 12 balloons

b. 24 balloons were at the party.

c. 24 plates and 20 cups were used

**Step-by-step explanation:**

We need to identify first the number of cups so that we can double the quantity for plates and divide the number to get the balloon number.

So if we have **24 cups** and we double it we have **48 plates** and if we divide in half to get the balloon number we get **12 balloons**, which in total is 84.

Then we just need tu add the 12 balloons **Tammy **brought to have **24 balloons**, and at the end to obtain how many plates and cups were used we just need to subtract the items left to the items bought so we get half plates from 48 is **24 plates** and 24 cups minus 4 cups left we have **20 cups** used in the party.

The important number that we firstly need to calculate is the one that need to be multiply or divided in order to obtain all the results.

**Answer:**

10

**Step-by-step explanation:**

(x - 4) × 2 = 12

x - 4 = 12 ÷ 2

x - 4 = 6

x = 10