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Angelina_Jolie [31]
2 years ago
13

Which is a zero of the quadratic function f(x) = 9x2 – 54x – 19?

Mathematics
1 answer:
liraira [26]2 years ago
7 0

Answer: Third Choice. x= 6 1/3

Step-by-step explanation:

Given

f(x) = 9x² - 54x - 19

Completing the square

3x          -19

3x          1

Substitute back to the function

f(x) = (3x-19) (3x+1)

Simplify

x= 6 1/3 or -1/3

Hope this helps!! :)

Please let me know if you have any questions

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If Hank shoots from inside the three-point line, what can be said about his distance from the center of the basket?
Digiron [165]

Answer:

If Hank shoots from inside the three-point line we can say that he has to shoot 246 inches to make the ball into the hoop.

4 1
3 years ago
A box contains 10 balls, of which 3 are red, 2 are yellow, and 5 are blue. Five balls are randomly selected with replacement. Ca
VLD [36.1K]

Answer:

The required probability is 0.1.

Step-by-step explanation:

red balls = 3

yellow balls =  2

blue balls = 5

Selected balls = 5

Number of elemnets in sample space = 10 C 5 = 1260

Ways to choose 1 red ball and 4 other colours =  (3 C 1 ) x (7 C 4) = 105

Ways to choose 5 balls of other colours = 7 C 5 = 21

So, the probability is

\frac{105}{1260} + \frac {21}{1260}\\\\\frac{126}{1260}=0.1  

8 0
3 years ago
A necklace and earrings cost $144. Six necklaces and five pairs of earrings cost $825
hram777 [196]

Step-by-step explanation:

let necklace : x

let earrings : y

x+y=144 -1st eqn

6x+5y=825 -2nd eqn

y=144-X -3rd eqn

substitute eqn into 2nd eqn

6x+5(144-x)= 825

6x +720-5X =825 (expanded)

X = 825-720

X =105

substitute "X=105" into 1st eqn

(105)+y=144

y= 144-105

y=39

1 necklace = 105$

1 pair of earrings = 39$

(to check back: substitute the value into the original eqn)

6 0
2 years ago
How many times does 48 go into 80
anastassius [24]
1.666666666666667 to be exact, but rounded it is 1.66
3 0
3 years ago
Read 2 more answers
What shape will you get if you put 3 diamonds together
8_murik_8 [283]

I think just a trapezoid no others

Hope I helped, Good luck

 = )

4 0
3 years ago
Read 2 more answers
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