This what i need help on

3rd choice: q+n=23 .25q+.05n=3.15

Step-by-step explanation:

Since there are 23 coins that is your base amount of nickles and quarters, then each ones amount added is 3.15

Option C; q + n = 23, 0.25q + 0.05n = 3.15

Step-by-step explanation:

~ We can say see that q  ⇒ count of quarters, and n ⇒ count of nickels

1. If that is true, it would be that q + n = 23, as the total number of coins would = the count of quarters + count of nickels, knowing that there are only these 2 types of coins.

2. Provided a quarter costs 0.25 of a dollar, and a nickel costs 0.05 of a dollar, 0.25 * number of quarters ⇒ the cost of these number of quarters, and 0.05 * number of nickels ⇒ the cost of these number of nickels. That would make 0.25 * q and 0.05 * n. That being said we could say that 0.25 * q + 0.05 * n ⇒ total cost of coins, which is $3.15. This would make the equation: 0.25q + 0.05n = 3.15

3. This leaves us with two equations: q + n = 23, and 0.25q + 0.05n = 3.15. This would lead to ⇒ Option C

-3

step-by-step explanation:

a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3

d

step-by-step explanation: