2 years ago

How long will it take for an undersea sonar pulse to travel 3 km?

Mathematics

1 answer:

Deffense [45]2 years ago

6 0

Answer:

2 seconds

Step-by-step explanation:

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X^2 + 3x - 4<br><br> please answer quickly! i will mark whoever answers first as brainliest <3

vlabodo [156]

Answer:

(x-1) (x+4)

Step-by-step explanation:

Factor x^2+3x-4 using the AC method

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3 years ago

What is the square root of 1024?

Serjik [45]

Answer:

square root of 1024 is 32

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3 years ago

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A water balloon is 5 feet above the ground when Sally launches it into the air. Use the quadratic equation 0 = -t^2 + 4t + 5 to

rodikova [14]

Answer:

$t=5\ sec$

Step-by-step explanation:

we have

$-t^{2} +4t+5=0$

Solve the quadratic equation to find the zero's or x-intercepts

Remember that

The x-intercepts are the values of x when the value of y is equal to zero ( water balloon reach the ground)

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$-t^{2} +4t+5=0$

$a=-1\\b=4\\c=5$

substitute in the formula

$t=\frac{-4(+/-)\sqrt{4^{2}-4(-1)(5)}} {2(-1)}$

$t=\frac{-4(+/-)\sqrt{36}} {-2}$

$t=\frac{-4(+/-)6} {-2}$

$t=\frac{-4(+)6} {-2}=-1$

$t=\frac{-4(-)6} {-2}=5$

therefore

the solution is $t=5\ sec$

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3 years ago

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8fsquare + 4f - 60 <br> its an math equation can anyone plz gimme the answer

hammer [34]

Answer:

f = -3 , 5/2

Step-by-step explanation:

8f² + 4f - 60 = 0

Divide the entire equation by 4

2f² + f - 15 = 0

Product = -30

Sum = 1

Factors = -5 , 6 {(-5)*6 = -30 and -5 +6 = 1}

2f² + f -15 = 0 {Rewrite the middle term using the factors}

2f² + 6f - 5f -15 = 0

2f(f + 3) - 5(f + 3) = 0

(f +3) (2f - 5) = 0

f +3 = 0 ; 2f -5 = 0

f = -3 ; 2f = 5

f = 5/2

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3 years ago

A line in the xy-plane with the slope -4/5 passes through the point (3,4). Which of the following points lies on the line?

Rama09 [41]

Answer:

(9,3)

Step-by-step explanation:

I don't think any of the answer choices are correct 9/3 is

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3 years ago