To turn left from a one-way street onto a one-way street, a driver should use: the lane closest to the left curb.
<h3>What is a traffic signal?</h3>
A traffic signal is a sign that is erected beside or above roads by a road safety agency, so as to give warnings and instructions to road users such as:
At some intersections, a driver should use the lane that is closest to the left curb when turning left from a one-way street onto a one-way street.
Read more on traffic signal here: brainly.com/question/22768531
#SPJ1
Answer:
-12
Explanation:
We are given information to solve for 2 variables x and y. To solve this I substituted 3x for y in the equation 5x - 4y = 21
So substituting gets us 5x - 4(3x) = 21
and we can solve the equation for x
5x - 12x = 21
-7x = 21
x = -3
Now that we have found x, we can find y simply by putting it in the equation y = 3x
y = 3(-3) = -9
Once we have both variables, we can find the answer to x + y
-3 + -9 = -3 - 9 = -12
So the answer to the question
x + y = -12
The minimum number of photons of green light that can be detected by the human eye is 6.
Given that;
E = nhc/λ
E = energy of the photon = 
J
n = number of photons = ?
h = Planks constant = 
Js
c = speed of light = 
m/s
λ = 
m
Making number of photons the subject of the formula;
n =
n = 6 photons
Learn more: brainly.com/question/9260704
