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Arada [10]
2 years ago
13

Which are the solutions of x2 = –13x – 4? 0, 13 0, –13

Mathematics
2 answers:
Shkiper50 [21]2 years ago
5 0
Rewrite in quadratic form:
x² + 13x + 4 = 0 
The best approximations, given the options, are 0 and -13
The actual solution is -0.3 and -12.7
Nezavi [6.7K]2 years ago
5 0

Its D................

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A 63 liter mixture contains milk and water in a ratio of 4:5. then x liters of milk and y liters of water are added to the mixtu
KatRina [158]

Answer:

X+y=237Litres

Step-by-step explanation:

Let a be mixture of milk and water.

Let x =milk

Let y= water

z = x+y

Final volume of mixture =63litres + z

5/12(3+z))+60=8/15(63-z)

z =x+y= 237litres

4 0
2 years ago
. A system may become infected by some spyware through the internet or e-mail. Seventy percent of the time the spyware arrives v
dem82 [27]

Answer:

This spyware is detected 66% of the time.

Step-by-step explanation:

We have these following percentages:

70% of the time, the spyware arrives via the internet, and in this case, is detected 60% of the time.

30% of the time, the spyware arrives via e-mail, and in this case, is detected 80% of the time.

What percentage of times is this spyware detected

Sum of 60% of 70%(arrived via spyware, detecte) and 80% of 30%(arrive via e-mail, detected). So

0.6*0.7 + 0.8*0.3 = 0.42 + 0.24 = 0.66

This spyware is detected 66% of the time.

3 0
2 years ago
A car manufacturer advertises that its new sports car has a turning radius of only 16 feet. The front tires are 4.5 feet apart.
Simora [160]

Answer:

12.5..............................

3 0
1 year ago
Read 2 more answers
Find the partial derivatives indicated Assume the variables are restricted to a domain on which the function is defined. z=x8+3y
ahrayia [7]

Answer:

Step-by-step explanation:

The question is incomplete. Here is the complete question.

Find the partial derivatives indicated Assume the variables are restricted to a domain on which the function is defined. z=x^{8}+3^{y}+x^{y}

a) Zx b) Zy

In differentiation, if y = axⁿ, y' = nax^{n-1} \ where \ n\ is\ a\  constant. Applying this in question;

Given the function z = x⁸+3^{y}+x^{y}

Z_x = \frac{\delta z}{\delta x} = 8x^{7} + 0 + yx^{y-1} \\\frac{\delta z}{\delta x} = 8x^{7} + yx^{y-1} \\

Note that y is treated as a constant since we are to differentiate only with respect to x.

For Zy;

Z_y = \frac{\delta z}{\delta y} =0+ 3^{y} ln3 + x^{y}lnx \\\frac{\delta z}{\delta y} = 3^{y} ln3 + x^{y}lnx } \\

Here x is treated as a constant and differential of a constant is zero.

6 0
2 years ago
Subtract 8 feet from 9 yards, 1 foot
BabaBlast [244]

Answer:

20 feet

Step-by-step explanation:

(9 yards 1 foot)-(8 feet) =  20

6 0
2 years ago
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