I do not know which formula to use however, i think its the top/green one Rashawn bought a CD that cost $19.99 and paid $21.56, including sales tax. What was the rate of the sales tax

It's the first one.

Step-by-step explanation:

Using the formula, Total Cost = Purchase Price + Sales Tax,

Let x be the sales tax

$21.56 = $19.99 + x

At this point, it's very easy to do this. To find x, you subtract $19.99 from the total cost or $21.56.

$21.56 - $19.99 = $1.57 hence the sales tax is $1.57.

How can we check our answer?

If you aren't sure if you are correct, just add the purchase price with the sales tax.

$19.99 + $1.57 = x

$19.99 +$1.57 = $21.56

It is the same as the Total Cost so $1.57 is your correct answer.

It asks for the rate, not the sales tax. Continuing with this, to find the rate, you do Sales Tax/Purchase Price = Rate of Sales Tax/100%

1.57/19.99 = x/100%

Cross multiply: 19.99*x = 1.57*100

19.99*x = 157

Then, do

19.99*x/19.99 = 157/19.99 which is equal to 7.85392696%, round that to 7.85%

So the rate of the sales tax is 7.85%

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

answer: the dogs need to shift their focus to human scent.

its because the dogs being trained are for search and rescue thus they need to be able to track humans and their specific scent