Answer:
C
Step-by-step explanation:
Calculate AC using Pythagoras' identity in ΔABC
AC² = 20² - 12² = 400 - 144 = 256, hence
AC =
= 16
Now find AD² from ΔACD and ΔABD
ΔACD → AD² = 16² - (20 - x)² = 256 - 400 + 40x - x²
ΔABD → AD² = 12² - x² = 144 - x²
Equate both equations for AD², hence
256 - 400 + 40x - x² = 144 - x²
-144 + 40x - x² = 144 - x² ( add x² to both sides )
- 144 + 40x = 144 ( add 144 to both sides )
40x = 288 ( divide both sides by 40 )
x = 7.2 → C
Answer:
the answer is A and B
Step-by-step explanation:
it looks correct to me
ps. i hate savvas realize
550+40W=S is the equation and after 11 weeks, she would have $990
Answer:
25 miles per hour
Step-by-step explanation:
Given



The joint variation can be represented as:

Where:

Required
Find V, when: 
We have:

Express as an equation

Where k is the constant of variation
Make k the subject

When: 
We have:



When: 
We have:

Substitute:
and 

Make V the subject


