-2y +5 < 9
-2y < 9 - 5
-2y < 4
y < 4/2
y < 2.
Given a scalar number
and a vector
v, the product between
and
v is a vector, with
- magnitude given by the product between the absolute value of
and the magnitude of
v- direction given by the sign of
: if a is positive, the final vector has same direction of
v; if a is negative, the final vector has opposite direction to
v.
In our problem, the scalar number is
. This means that the product between the vector and this number:
- has magnitude equal to
times the magnitude of the vector
- has opposite direction with respect to the original vector (because the scalar
is negative)
Therefore, the correct answer is
<span>B.) The vector will change direction and decrease in magnitude.</span>
Answer:
x + y = 900
5x + 9y = 6500
400 children
Step-by-step explanation:
Let:
Children = x ; adult = y
x + y = 900 - - - (1)
5x + 9y = 6500 - - - (2)
From (1)
y = 900 - x
Put y = 900 - x in (2)
5x + 9(900 - x) = 6500
5x + 8100 - 9x = 6500
-4x = 6500 - 8100
-4x = - 1600
x = 1600 / 4
x = 400
Answer:
The age of E is 40
Step-by-step explanation:
When E didn't join them, the average age was 30,that is six years ago. But present making 36.
But when E joined, the average age is now 40.