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krek1111 [17]
2 years ago
12

Evaluate the expression when x=1/2 and y=-5 -2xy

Mathematics
2 answers:
Ainat [17]2 years ago
5 0

Answer: Y=-5/2

Step-by-step explanation:

Komok [63]2 years ago
4 0

Answer:

5

Step-by-step explanation:

=-2 times 1/2 times -5

=-1 times -5 (negative times negative equals positive)

=5

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Use the quadratic formula to determine the exact solutions to the equation.
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Answer:

x= 2.28

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Step-by-step explanation:

2x²-5x+1 =0

a= 2, b= -5 and c= 1

x= (-b <u>+</u> √(b²-4ac))/2a

= (5 <u>+</u> √(25-8))/4

= (5 <u>+</u> √17)/4

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Arrange the following polynomial into descending order and identify the 3rd term.
Vera_Pavlovna [14]
Thank you for posting your question here at brainly. Feel free to ask more questions.  

The best and most correct answer among the choices provided by the question is <span>18x</span>.<span>       
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An ice cream cone is filled with vanilla and chocolate ice cream at a ratio of 2:1. If the diameter of the cone is 2 inches and
Sophie [7]
Volume of cone=(1/3)hpir^2

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V=(1/3)6pi1^2
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8 hundredths times 10
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5 0
3 years ago
Determine the angles made by the vector v = (67)i + (-15)j with the positive x- and y-axes. write the unit vector n in the direc
vivado [14]
Consider the picture attached.

From right triangle trigonometry: 

tan(α)=(opposite side)/(adjacent side)=15/67=0.2239

using a scientific calculator we find that arctan(0.2239)=12.62°

thus α=12.62°, is the angle that the vector makes with the positive x-axis.

The angle made with the + y-axis is 12.62°+90°=102.62°.



The length of the vector v can be determined using the Pythagorean theorem:

|v|= \sqrt{ 67^{2} + 15^{2} }= \sqrt{4489+225}= \sqrt{4714}=68.8


Thus, to make v a unit vector, without changing its direction, we need to divide v by |v|=68.8. 

This means that the x and y components will also be divided by 68.8, by proportionality.

So, the unit vector in the direction of v is:

<span>(67/68.8)i + (-15/68.8)j=0.97 i + (- 0.22)j
</span>

Answer: 12.62°;  102.62°;  0.97 i + (- 0.22)j

6 0
3 years ago
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