Multiply the first equation by 5
20x -15y = -200
multiply the second equation by 3
27x +15y =12
add the 2 new equations
20x-15y +27x +15y = -200 +12
47x = -188 (devide each side by 47)
x = -4
substitute x with -4 in any equation you like (I'll choose the second)
9*(-4) +5y =4
-36+5y=4 (add 36 to each side)
5y= 40
y= 8
Answer:
Step-by-step explanation:
Let's solve this by making an equation.
$9 for the helmet, and $5.25 per hour.
h will stand for hours, C will stand for Amanda's cost.
Now, substitute in what we learned from the problem.
This is an equation you can use to solve for the hours.
The probability that an animal has stripes will be 0.86.
<h3>How to calculate the probability?</h3>
The probability that an animal has stripes will be:
= Orange stripes + Brown stripes + Grey stripes
= 0.16 + 0.3 + 0.4
= 0.86
The probability that an animal doesn't have stripes will be:
= 1 - 0.86
= 0.14
Therefore, the probability that an animal doesn't have stripes is 0.14.
Learn more about probability on:
brainly.com/question/24756209
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Since the 40 degree angle and the bottom left angle both have the same red curve on them, the two angles are equal. So, they are both 40 degrees.
With this, we can make the equation .
To continue: know that the three angles of any triangle add up to 180 degrees. One of the angles in the left triangle is 90 degrees, as shown by the symbol that looks like a square. We can now make an equation where we add up all three angles in the left triangle, and set it equal to 180, like this: .
Now that we have 2 equations, we can find what x and y are. Let's first list the equations we got:
Now solve.
x is 3, y is 1.
Divide the number of possible outcomes by the number of total outcomes.
Green: ≈ 0.55
Red: = 0.45
Since only red counters were added, this changes the probability of the counter being red to 0.6 or 60% and the probability of it being green to 0.4 or 40%. This means that the change in probability for the red counters was 15% or 0.15.
Set up a proportion:
, so x = 1.65, which rounds to 2 red counters.
We can prove this by adding 5 + 2 red counters. 7/11 = 0.6 or 60% chance.
Your final answer is 2 red counters were added.
Hope this helped. Get well soon.