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3 years ago

5. A function is given below. f(x) = 3x2 - x + 6 What is f(2)? 2

Mathematics

2 answers:

goldenfox [79]3 years ago

7 0

Answer: 10

Step-by-step explanation:

f(x)= 3 (2) - x + 6

f(x)= 6 - 2 + 6

f(x)= 4 + 6

f(x) = 10

shtirl [24]3 years ago

3 0

Hey someone already answered your question but I need to answer 1 so I can ask another 1 but your answer is 10

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Which expression is equivalent to -3(4x - 2)- 2x

nadezda [96]

Answer:

-12X+6+6x

Step-by-step explanation:

8 0

3 years ago

What is the slope of the function? Then changed the line so it had a slope of 2, but still went through the same point. Which eq

alisha [4.7K]

Complete question is;

Alejandra correctly wrote the equation y – 3 = (1/5) (x – 10) to represent a line that her teacher sketched. The teacher then changed the line so it had a slope of 2, but still went through the same point. Which equation should Alejandra write to represent the new line?

Answer:

y – 3 = 2(x – 10)

Step-by-step explanation:

Since the original line is;

y – 3 = (1/5) (x – 10)

This means the slope is 1/5 and the x and y coordinates are (10, 3) respectively.

Now, if she changes the slope to 2 and it still passed through the same point, then it means it's x and y points are still (10, 3). Thus, the equation will now be;

y – 3 = 2(x – 10)

4 0

3 years ago

I've been stuck on this for so long and I have an exam soon, anybody who can help me :'( ?

san4es73 [151]

(i) speed = distance / time
so time = distance / speed
here we have

time t = 1080/x hours

(ii) return flight time = 1080 / (x + 30) hours

(a) 1080/x - 1080/(x + 30) = 1/2

Multiplying through by the LCD 2x(x + 30) we get:-

1080*2(x + 30) - 2x*1080 = x(x+30)
2160x + 64800 - 2160x = x^2 + 30x
x^2 + 30x - 64800 = 0

(b) factoring; -64800 = 270 * -240 ans 270-240 = 30 so we have

(x + 270)(x - 240) = 0 so x = 240 ( we ignore the negative -270)

So the speed for outward journey is 240 km/hr

(c) time ffor outward flight = 1080 / 240 = 4 1/2 hours

(d) average speed for whole flight = distance / time
Time for outward journey = 4.5 hours and time for return journey = d / v
= 1080 / (240+30) = 4 hours
Therefore the average speed for whole journey = 2160 / 8.5 = 254.1 km/hr

8 0

3 years ago

your grades on tests 1 2 and 4 are 82 76 and 90. unfortunately you cut the third test and received a 0. If you have one test lef

Dmitrij [34]

Answer: No, he can't pass the course.

Explanation:

Since we have given that

Marks on tests 1, 2, and 4 are given by

82, 76, 90 respectively.

Unfortunately, he cut the third test and receive a 0.

According to question, we have given that passing grade for the course is 70, and his one test left to take ,

Let the marks obtained in fifth test be x

So,

$\frac{82+76+90+0+x}{5}=70\\\\248+x=5\times 70=350\\\\x=350-248\\\\x=102$

And it is not possible to get 102 over 100.

so, he can't still pass the course.

Hence, No, he can't pass the course.

8 0

4 years ago

A survey of Lakeview High School students found that 72% of the students had eaten breakfast that morning. If two students are c

AfilCa [17]

Answer:

4.26 * 10^-12

Step-by-step explanation:

Usibg the binomial probability relation :

P(x =x) = nCx * p^x * q^(n-x)

Probability of success = probability of not eating = 1 - 0.72 = 0.28

p = 0.28

q = 1 - p = 0.72

Probability that atleast one out of 2 chosen did not eat breakfast :

P(x ≥ 1) = p(x = 1) + p(x = 2)

P(x ≥ 1) = (100C1 * 0.28^1 * 0.72^99) + (100C2 * 0.28^2 * 0.72^98)

= 4.26 * 10^-12

6 0

3 years ago