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3 years ago

Help please I need help

Mathematics

2 answers:

igor_vitrenko [27]3 years ago

4 0

Answer:

Step-by-step explanation:

Vedmedyk [2.9K]2 years ago

4 0

Answer:

na saan Po yong question

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Write the expression in simplified radical form. Show all steps and work (7-2√5)/(11+√5)

ludmilkaskok [199]

Multiply 11-√5 by 11+√5 .the answer is 121-5=116
so the fraction is turned into (7-2√5)(11+√5)/116
77+7√5 -22√5 -10=66-15√5/116

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3 years ago

If f(x) = 2x2 + 1, what is f(x) when x = 3?

ikadub [295]

$f(x)=2x^2+1\\\\\text{substitute the value of x to the equation of the function}\\\\f(3)=2\cdot3^2+1=2\cdot9+1=18+1=19$

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3 years ago

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What is 22,900 written in a scientific notation

Sergeeva-Olga [200]

Answer: 2.29 x 10^4

Step-by-step explanation:

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3 years ago

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What is the equation of the graph below? A graph shows a parabola that opens up with a vertex at negative three comma negative o

Tomtit [17]

Answer:

$y=(x+3)^2-1\\y=x^2+6x+8$

Step-by-step explanation:

Given:

Vertex of the parabola is, $(h,k)=(-3,-1)$

Equation of the parabola in vertex form is given as:

$y=(x-h)^2+k$

Plug in $h=-3,k=-1$ . This gives,

$y=(x-(-3))^2+(-1)\\y=(x+3)^2-1$

Therefore, the equation of the given graph is

$y=(x+3)^2-1\\y=x^2+6x+8$ .

5 0

3 years ago

A signal light is green for 4 minutes, yellow for 10 seconds, and red for 3 minutes. If you drive up to this light, what is the

posledela

Answer:

0.56 is the required probability.

Step-by-step explanation:

Time for which signal shows green light = 4 minutes

Time for which signal shows yellow light = 10 seconds

Time for which signal shows red light = 3 minutes

To find:

Probability that the signal will show green light when you reach the destination = ?

Solution:

First of all, let us convert each time to same unit before doing any calculations.

Time for which signal shows green light = 4 minutes = 4 $\times$ 60 seconds = 240 seconds

Time for which signal shows yellow light = 10 seconds

Time for which signal shows red light = 3 minutes = 3 $\times$ 60 seconds = 180 seconds

Now, let us have a look at the formula for probability of an event E:

$P(E) = \dfrac{\text{Number of favorable cases}}{\text {Total number of cases}}$

Here, E is the event that green light is shown by the signal.

Number of favorable cases mean the time for which green light is shown and Total number of cases is the total time (Time for which green light is shown + Time for which Yellow light is shown + Time for which red light is shown)

So, the required probability is:

$P(E) = \dfrac{240}{240+10+180}\\\Rightarrow P(E) = \dfrac{240}{430}\\\Rightarrow \bold{P(E) \approx 0.56 }$

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2 years ago