Answer:
The answer is 30
Step-by-step explanation:
To get a.b
For a = <wa, za> and b = <wb, zb>, the dot product represents multiplication sign.
We say,
a•b = (wa)(wb) + (za)(zb)
The next step is to substitute the given information into the above equation we generated.
Then we say,
a•b = 5•4 + 2•5
a.b = 20 + 10
a•b = 30
The answer is 30
Total was 200
x+y=200
biking was 40 mor than bus
x=40+y
subsitute 40+y for x in other equation
x+y=200
40+y+y=200
40+2y=200
minus 40 both sides
2y=160
divide both sides by 2
y=80
sub back
x=40+y
x=40+80
x=120
120km biked
80km on bus
Answer:
Yes.
Step-by-step explanation:
I don't really know how to explain this other than use a calculator.
Hope that this helps!
