Answer:

Step-by-step explanation:
The given vectors are u=7i + 3j and v=-4i + 3j, find 5u-4v in terms of unit vectors i and j.
We substitute the vectors to get:

We perform the scalar multiplication to get:

Group the components;

We simplify to get:

Answer:
-9/5
Step-by-step explanation:
Xy^2/-5 becomes (9)(1^2) / (-5) when x = 9 and y = 1.
This simplifies to -9/5
(3) 8
Step-by-step explanation:
Note that ∆ADE is similar to ∆ABC. As such, the ratios of their legs are equal. Also note that AD = AB + BD.
BC/AB = DE/AD
BC/10 = 12/(10 + 5) = 12/15 = 4/5
or
BC = 10(4/5) = 8
Answer:
B.
÷ 
Step-by-step explanation:
its a formula
Answer:
5 times as large
Step-by-step explanation:
The ratio of the two numbers tells you how many times as large one is as the other:
