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3 years ago

Which should i choose

Mathematics

2 answers:

vaieri [72.5K]3 years ago

6 0

Answer:

The first one

Step-by-step explanation:

The first one is correct because it simply subtracts the same amount from both sides of the equation since you do PEMDAS backwards for finding an variable, so you subtract or add first. Subtracting by the constant on both sides allows you to isolate the variable, so the first step is correct.

Fantom [35]3 years ago

6 0

The first one would be the answer

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Find the zeros of the function f(x)=2x^2-7x-30

ivanzaharov [21]

$2x^2-7x-30=0 \\ \\
a=2 \\ b=-7 \\ c=-30 \\
b^2-4ac=(-7)^2-4 \times 2 \times (-30)=49+240=289 \\ \\
x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}=\frac{-(-7) \pm \sqrt{289}}{2 \times 2}=\frac{7 \pm 17}{4} \\
x=\frac{7-17}{4} \ \lor \ x=\frac{7+17}{4} \\
x=\frac{-10}{4} \ \lor \ x=\frac{24}{4} \\
x=-\frac{5}{2} \ \lor \ x=6 \\
\boxed{x=-2.5 \hbox{ or } x=6}$

6 0

3 years ago

A group of three people are selected at random, what is the probability that all the three people have different birthdays.

Tanya [424]

Answer:

1:1

Step-by-step explanation:

this is because they are selected at random 3/3=1

5 0

3 years ago

Aiden works at a lab with a huge circular particle accelerator. It has a diameter of 8 kilometers. What is the accelerator's rad

Kipish [7]

Step-by-step explanation:

Diameter = 2x Radius

Radius = 1/2 Diameter

$= \frac{1}{2} \times 8 \\ = 4km$

6 0

3 years ago

Read 2 more answers

Consider f(x) = 1.8x – 10 and g(x) = −4.

Pavlova-9 [17]

Answer:

Part 1) The equation that can be used is 1.8x-10=-4

Part 2) The input or x-value is x=10/3

Step-by-step explanation:

we have

f(x)=1.8x-10

g(x)=-4

To find the solution of the system of equations equate f(x) and g(x)

f(x)=g(x)

substitute

1.8x-10=-4 -----> equation that can be used to find the input value at which f (x ) = g (x )

Solve for x

Adds 10 both sides

1.8x=-4+10

1.8x=6

Divide by 1.8 both sides

x=6/1.8

Remember that

1.8=18/10

substitute

x=6/(18/10)

x=60/18

Simplify

x=10/3

8 0

3 years ago

What is the domain of the function f(x)= e^x/e^x+c if c is a constant greater than 0

Viktor [21]

Answer: Option d.

Step-by-step explanation:

To find the domain of the function we should look for the values for which the denominator is equal to zero, because the division by zero is not allowed.

We know by definition that the function $e^x$ is always greater than zero for all x.

We know that the constant c is greater than zero (c>0).

Then, the expression $e^x+c$ is never equal to zero.

Therefore, it does not exist a value for x that makes the denominator 0. Then, the domain of the function is all real numbers.

The answer is the option d.

3 0

3 years ago

Which should i choose​

Which should i choose