8x+15=7
In the statement the phrase the sum of can tell you that it is going to be an addition problem. So 8x ( eight times a number) would be added to the 15, 8x+15. Since its an addition problem the part where it says ' ... is seven', you know that it will all equal 7. So the answer would be 8x+15=7.
The third one is the answer
Answer:
none of the given options is true
Step-by-step explanation:
Given: u=(-8,8) , v= (-1,2)
To find: vectors
such that 
Solution:
A vector is a quantity that has both magnitude and direction.

Let 
So,

So, u = 
So, none of the given options is true
Answer:
it clicked by it self sorry can't help
Step-by-step explanation:
Answer:
r=90
q=45?
t=52
Step-by-step explanation: