**Answer:**

54 seconds

**Step-by-step explanation:**

**Answer:**

3

**Step-by-step explanation:**

These are similar triangle

We can use ratios to solve

12 12+4

------ = ----------

9 9+DC

Using cross products

12( 9+DC) = 9*(12+4)

12 (9+DC) = 9*16

Divide each side by 12

12/12 (9+DC) = 9*16/12

9+DC = 12

Subtract 9 from each side

9+DC-9 =12-9

DC =3

<u><em>**Answer:**</em></u>

Savanna had 6 more iris blooms this year

<u><em>**Explanation:**</em></u>

<u>**We are given that:**</u>

Last year, she had 40 iris blooms

This year, she has 15% more iris blooms than last year

<u>This means that:</u>

This year she has = (40 + 15% of 40) iris blooms

This year she has = 40 + 0.15(40)

This year she has = 40 + 6 = 46 iris blooms

<u>**Now, we get the increase in the number of blooms:**</u>

Increase = amount she has this year - amount she had last year

Increase = 46 - 40 = 6 iris blooms

Hope this helps :)