3 years ago

Evaluate the expression 3 4/5x − 2 1/2 for x = −5.

Mathematics

1 answer:

Dafna11 [192]3 years ago

4 0

Answer:

Step-by-step explanation: subscribe to my channel plz trying to blow up channel- dav slayer

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Multiply. Express each answer as a decimal. 12⋅15 34⋅200 (0.2)⋅60 (0.75)⋅20

katovenus [111]

Answer:

12×15=180
34×200=6800
(0.2)×60=12
(0.75)×20=15

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3 years ago

Find all the zeros of the equation -3x^4 + 27x^2 + 1200 = 0

guajiro [1.7K]

Answer:

$\displaystyle x=-5,\ x=5,\ x=4i,\ x=-4i$

Step-by-step explanation:

Biquadratic Equation

It's a fourth-degree equation where the terms of degree 1 and 3 are missing. It can be solved for the variable squared as if it was a second-degree equation, and then take the square root of the results

Our equation is

$\displaystyle -3x^4+27x^2+1200=0$

If we call $y=x^2$ , our equation becomes a second-degree equation

$\displaystyle -3y^2+27y+1200=0$

Dividing by -3

$\displaystyle y^2-9y-400=0$

Factoring

$\displaystyle (y-25)(y+16)=0$

It leads to these solutions

$\displaystyle y=25\ ,\ y=-16$

Taking back the change of variable, we have for the first solution

$\displaystyle x^2=25\Rightarrow x=-5,x=5$

Now for the second solution, we get imaginary (complex) values

$\displaystyle x^2=-16\Rightarrow x=4i,\ x=-4i$

Summarizing, the four solutions for x are

$\displaystyle x=-5,\ x=5,\ x=4i,\ x=-4i$

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3 years ago

Write a linear function with the values f(-1)=8 and f(5)=6

lukranit [14]

(-1,8) and (5,6) are points on the line.
Slope of line = (8-6)/(-1-5) = 2/(-6) = -⅓
y-6 = -⅓(x-5)
y = -⅓x + 5/3 + 6 = -⅓x + 7⅔

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3 years ago

Calculate the score percentage if out of 15 shots, 12 are successfull.

schepotkina [342]

80% is the score percentage

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3 years ago

Bucky received $100 for his birthday. How many hours can he jet ski on Lake Smellsomemore if costs $15

mario62 [17]

Answer:

b hours

Step-by-step explanation:

100 minus the 10 on the jacket equals 90. 90 divided by 15 is 6

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3 years ago