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mixer [17]
3 years ago
14

WILL GIVE A BRAINLIEST!!

Mathematics
2 answers:
sergij07 [2.7K]3 years ago
4 0
If the vertex is at the maximum point they dy/dx=0 at that point...

dA/dx=-2x+4

dB/dx=-2x+8

dC/dx=2x-4

dD/dx=2x-8

So both B and D have a zero velocity at x=4, but only B is equal to 3 when x=4

B. is the correct quadratic with the vertex at (4,3)
scoray [572]3 years ago
3 0

Answer:

<h2>B.</h2><h2>  y=-x^{2} +8x-13</h2>

Step-by-step explanation:

We know that the vertex of the parabola is

V(4,3)

That means this points is being intercept by the parabola. In other words, the function that represents this parabola has to have this relation, when x=4, y=3.

So, you can observe that the second choice has a function that follows this relation. Let's see

y=-x^{2} +8x-13

So, for x=4

y=-(4)^{2} +8(4)-13\\y=-16+32-13\\y=3

Therefore, function B is the answer because it includes the vertex at its relation.

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Sasha has 3.20 in U.S. coins. She has the same number of quarters and nickels. What is the greatest number of quarters she could
RSB [31]

Answer:

10 quarters = $2.50

10 nickels = $0.50

that leaves $0.20 for other coins (dimes / pennies)

Step-by-step explanation:

First, suppose she has only quarters and nickels and no other coins.  Then if C is the identical number of coins of each type, then 5C + 25C = 320, so 30C = 320 and 3C = 32, but there is no integer solution to this.  So she must have at least one other type of coin.

Assume she has only quarters, nickels, and dimes.  Then if D is the number of dimes, 5C +  25C + 10D = 320, which means 30C + 10D = 320, or 3C + D = 32.  The smallest D can be is 2, leaving 3C = 30 and thus C = 10.  So in this scenario she would have 10 quarters, 10 nickels, and two dimes to make $2.50 + $0.50 + $0.20 = $3.20.

This has to be the highest number, because if she had 11 quarters and 11 nickels, that alone would add up to 11(0.25) + 11(0.05) = $3.30, which would already be too much.

8 0
3 years ago
Read 2 more answers
Dustin bought 3 shirts and a belt. Each shirt cost the same amount of money, and the belt cost $22.50. If the total amount Dusti
Dvinal [7]
3x+22.5 = 69.75
    -22.5    -22.5

3x = 47.25
 /3       /3

x = 15.75

The price of each shirt before tax is $15.75
8 0
3 years ago
What is the exact value of <img src="https://tex.z-dn.net/?f=tan%5Cfrac%7B11%5Cpi%20%7D%7B12%7D" id="TexFormula1" title="tan\fra
AnnyKZ [126]

Notice that

11/12 = 1/6 + 3/4

so that

tan(11π/12) = tan(π/6 + 3π/4)

Then recalling that

sin(x + y) = sin(x) cos(y) + cos(x) sin(y)

cos(x + y) = cos(x) cos(y) - sin(x) sin(y)

⇒   tan(x + y) = (tan(x) + tan(y))/(1 - tan(x) tan(y))

it follows that

tan(11π/12) = (tan(π/6) + tan(3π/4))/(1 - tan(π/6) tan(3π/4))

tan(11π/12) = (1/√3 - 1)/(1 + 1/√3)

tan(11π/12) = (1 - √3)/(√3 + 1)

tan(11π/12) = - (√3 - 1)²/((√3 + 1) (√3 - 1))

tan(11π/12) = - (4 - 2√3)/2

tan(11π/12) = - (2 - √3) … … … [A]

8 0
2 years ago
What is 69 devided by 69<br> Can yah help and add me
kotykmax [81]

Answer:

the answer is 1

Step-by-step explanation:

69 goes into 69, 1 time

3 0
3 years ago
Read 2 more answers
Khairul deposited $ 600 in a bank at the end of 2010 and another $ 400 in the same bank at the end of 2011. The bank offers simp
castortr0y [4]

Answer:

bat puro math pede history lng

5 0
2 years ago
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