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3 years ago

11

Solve by graphing. x2 + 2x – 3 = 0

2 answers:

Andrei [34K]3 years ago

4 0

The graph is attached

tigry1 [53]3 years ago

3 0

The graph of an equation is the set of all points that are solutions of the equation. Frequently, a relationship between two quantities can be expressed as an equation in two variables. For instance, we can write the equation of our problem as the following form:

$y=x^2+2x-3 \\ \\ Or: \\ \\ f(x)=x^2+2x-3$

So, by graphing $f(x)$ we want to know the x-intercepts. This graph is illustrated in the Figure below. As you can see, points in red are the solution to this problem that are the x-intercepts of our previously defined function $f(x)$ . These points are:

$(-3,0) \ and \ (1,0)$

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The sum of two and three times the difference of a number and five is equal to four times the difference a number and one.

Andru [333]

Answer:

$x=-9$

Step-by-step explanation:

We translate the phrase into an equation:

$2+3(x-5)=4(x-1)\\$

Then we simplify:

$2+3(x-5)=4(x-1)\\2+3x-15=4x-4\\-13+3x=4x-4\\-9=x$

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2 years ago

2. Patients arrive at a hospital accident and emergency department at random follow a

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a )i) 0.117

ii)0.4126

b)0.7769

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2 years ago

Jenny’s family is traveling on a long road trip. The first day they traveled 11,405.59 yards. On the second day they traveled 12

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32468.41 yards

Step-by-step explanation:

11,405.59 + 12,048.82 + 9,014 = 32468.41

32468.41 yards

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2 years ago

Data were collected from a typing class with 45 students. The class had an average of 56 words per minute (WPM) with a standard

STALIN [3.7K]

Answer:

Standard deviation gets smaller

Step-by-step explanation:

No. of students = 45

The class had an average of 56 words per minute (WPM) with a standard deviation of 7 WPM.

$Mean = \frac{\text{Sum of all observations}}{\text{No. of observations}}\\56=\frac{Sum}{45}\\56 \times 45=Sum\\2520=Sum$

The teacher realized that the data from one student who typed 55 WPM was not entered.

So, new sum = 2520+55

New sum =2575

So, new mean = $\frac{2575}{45}$

New mean =57.22

Standard deviation is the measure of distance between observation and mean

So, if number gets closer to mean , Standard deviation gets smaller . if the numbers get bigger , Standard deviation gets bigger.

Since 55 is closer to 57.22

So, Standard deviation gets smaller

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3 years ago

The school football team needs to raise at least $850 to buy new practice equipment. The team received a donation of $125 and al

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Answer:

182

Step-by-step explanation:

850-125=725

725/4=181.25

So you need at least 182 tickets sold.

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3 years ago