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3 years ago

Please help me can anyone solve this what is x^2+5x-7?

Mathematics

1 answer:

Mama L [17]3 years ago

7 0

Answer:

x = (-5+-sqrt(53))/2

Step-by-step explanation:

Apply the quadratic formula to this equation with a = 1, b = 5, and c = -7.

Plug it in then simplify.

Quadratic formula is x = (-b+-sqrt(b^2-4ac))/2a

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Answer:

Jesse swims the fastest with the rate of 5.5 ft in 1 second.

Step-by-step explanation:

The swimming rate of Elizabeth is: 50 feet in 10 seconds

So, the swimming rate per second is $\frac{50}{10} = 5 ft$

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Similarly,the swimming rate of Jesse is: 110 feet in 20 seconds

So, the swimming rate per second is $\frac{110}{20} = 5.5 ft$

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Step-by-step explanation:

Creating a table:

X :___0 __ 1 __ 2 ___ 3 ____ 4 ___ 5 ___ 6

P(x):0.02_0.03_0.07, 0.12, 0.30_ 0.28_0.18.

The standard deviation = sqrt(Var(x))

Var(x) = Σx²*p(x) - E(x)²

E(x) = ΣX*p(x)

E(x) = (0*0.02) + (1*0.03) + (2*0.07) + (3*0.12) + (4*0.30) + (5*0.28) + (6*0.18) = 4.21

Var(X) :

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19.67 - 17.7241

= 1.9459

Standard deviation = sqrt(Var(X))

Standard deviation = sqrt(1.9459)

Standard deviation = 1.3949551

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Please help me can anyone solve this what is x^2+5x-7?​

Please help me can anyone solve this what is x^2+5x-7?