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Anna35 [415]
2 years ago
10

What is the discriminant of -2x to the power of 2 -x-1=0

Mathematics
1 answer:
Lorico [155]2 years ago
8 0
Uhhh 67904- 67903-iwbisbeus e
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One person can do a certain job in 15 minutes and another person can do the same job in 30 minutes. How many minutes will it tak
Flauer [41]

Hello! Your answer is B, 10 minutes.

Say the x = minutes taken to do the job. You can set up an equation like this to solve this.

\frac{1}{15} x + \frac{1}{30} x = 1

This is representative of the situation. The fractions each represent <u>how much each person does in a minute</u>, and when they're multiplied by x, that's <u>how much of the project they get done</u> based off of the minutes they work together on the job. Add the two together, and you get <u>how much of the project is finished in x amount of time</u>. Set it equal to 1, as you are looking for 100% completion.

Once you have this equation, find a common denominator, add, and solve.

\frac{1}{15} x + \frac{1}{30} x = 1

\frac{2}{30} x + \frac{1}{30} x = 1

\frac{3}{30}x = 1

\frac{1}{10}x = 1

x = 10

Therefore, it will take them 10 minutes to do the job together.

Hope this helps!

8 0
3 years ago
Does anyone know what the slope should be
Lemur [1.5K]
The slope is 4/3.

rise/run
rise = 4
run = 3
5 0
2 years ago
34 + x = 40<br><br> what does "x" equal? :3<br><br> ~Potato
marissa [1.9K]
Try doing 40 - 34 first:
40 - 34 = 6
Now try 34 + 6
34 + 6 = 40
X=6
~Deceptiøn
6 0
3 years ago
Read 2 more answers
The rate of U.S. per capita sales of bottled water for the period 2007–2014 could be approximated by s(t) = 0.25t2 ? t + 29 gall
julsineya [31]

Answer:

117 gallons

Step-by-step explanation:

The expression that describes the rate of U.S. per capita sales of bottled water for the period 2007–2014 is:

s(t) = 0.25t^2-t+29

Since t=0 at 2007. At 2009 and 2013, t is:

t_1=2009-2007 = 2\\t_2=2013-2007 = 6

The definite integral of the expression from t=2 to t=6 is:

s(t) = 0.25t^2-t+29\\\int\limits^6_2 {s(t)} \, dt= \int\limits^6_2 {(0.25t^2-t+29)} \, dt\\\int\limits^6_2 {s(t)} \,dt= (\frac{t^3}{12} -\frac{t^2}{2}+29t +c)|^6_2 \\S(6) -S(2) = (\frac{6^3}{12} -\frac{6^2}{2}+29*6 +c) - (\frac{2^3}{12} -\frac{2^2}{2}+29*2 +c)\\S(6) -S(2) = 117.333\ gallons

Rounded to the nearest gallon, the estimated total U.S. per capita sales of bottled water from the start of 2009 to the start of 2013 is 117 gallons.

6 0
3 years ago
What is the different of 9.81 and 6.348
Sav [38]

Answer:

3.462

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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