MATHEMATICS HIGH SCHOOL

Which of the following expressions represents a function?{(1, 2), (4, –2), (8, 3), (9, –3)}

y2 = 16 − x2

2x2 + y2 = 5

x = 7

Answers

Answer 1
Answer: {(1, 2), (4, –2), (8, 3), (9, –3)} and x = 7 represents a function.

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W + 1200+209 = 2000This might seem easy but I seriously don’t know how to get to the answer

Answers

Answer:

591

Step-by-step explanation:

added the 2 in the equation and minused 2000 from that

3x²+5x-2=0 by any method

Answers

3x²+5x=2

x(3x+5)=2

x=2  or 3x+5=2
           
            x=3/5  

Which statements about the graph of the function f(x) = 2x2 – x – 6 are true? Check all that apply.The domain of the function is .
The range of the function is all real numbers.
The vertex of the function is .
The function has two x-intercepts.
The function is increasing over the interval (, ∞).

Answers

Hello,

1: dom f=R
2: img f =R
3: 2x²-x-6=2(x²-2x/4+1/46)-6-1/8=2(x-1/4)²-49/8
Vertex=(1/4,-49,8)

4: roots are -3/2 and 2
2(x-1/4)²-49/8=1/8[(4x-1)²-49]=1/8*(4x+6)(4x-8)

5:
From the vertex to ∞
[-1/4 , ∞)

Answer: -1/4, infinity

Step-by-step explanation:

If the diameter of a circle is 9 cm, then its circumference is 56.52 cm.

Answers

No.  That is not true.
Dπ=circumference (approximate)
9*π(or roughly 3.14)=28.26
If the RADIUS was 9,  then that would be true :D

Answer:

The answer is false

Step-by-step explanation:

A tree casts a 25 foot shadow. At the same time of day, a 6 foot man standing near the tree casts a 9 foot shadow. What is the approximate height of the tree to the nearest foot? A) 16 feet
B) 17 feet
C) 18 feet
D) 19 feet

Answers

Answer:

Answer is option b

17 feet.

Step-by-step explanation:

Given that A tree casts a 25 foot shadow. At the same time of day, a 6 foot man standing near the tree casts a 9 foot shadow.

for man actual height = 6 foot

Shadow = 9 foot

At a particular time, the height/shadow ratio would be constant

Hence 6/9 =x/25

Or x = 25(6)/9

x=16.67feet

Rounding off x=17 feet
ratio of object to shadow = 6/9 = x/25 (where x is the height of the tree)
x = (6 * 25)/9 = 16.67feet

x = approx. 17 feet

The points (-2,-4) and (8,5) are the endpoints of the diameter of a circle. Find the length of the radius of the circle.

Answers