Help pls with the math

What is a number,variable,or product,or a number and variables?

const2013 [10]

A variable is the letter next to a number such as x. (ex. 6y) the y would be the variable.

a product is the number you get at the end of the expression

5 0

3 years ago

I dont know if I got it right side I?

marissa [1.9K]

Answer:

the first one is right but the second one is -2 , not 2.

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

ON PLATO

velikii [3]

Answer:

Option A: f(x) = –3x² + 30x – 75

Step-by-step explanation:

To know which option is correct, we shall determine the discriminant of each equation since it gives the nature of the root of the equation.

Discriminant = b² – 4ac

NOTE:

1. If b² – 4ac < 0, it means the equation has no real roots.

2. If b² – 4ac = 0, it means the equation has only one real root.

3. If b² – 4ac > 0, it means the equation has two real roots

This can be obtained as follow:

For Option A:

f(x) = –3x² + 30x – 75

a = –3

b = 30

c = –75

Discriminant = b² – 4ac

Discriminant = 30² – (4 × –3 × –75)

Discriminant = 900 – 900

Discriminant = 0

Thus, the discriminant is equal to zero. This implies that the equation has only one real root.

For Option B:

f(x) = 2x² + 4x – 5

a = 2

b = 4

c = –5

Discriminant = b² – 4ac

Discriminant = 4² – (4 × 2 × –5)

Discriminant = 16 – (–40)

Discriminant = 16 + 40

Discriminant = 56

Thus, the discriminant is greater than zero. This implies that the equation has two real roots.

For Option C:

f(x) = 6x² + 11

a = 6

b = 0

c = 11

Discriminant = b² – 4ac

Discriminant = 0² – (4 × 6 × 11)

Discriminant = 0 – 264

Discriminant = – 264

Thus, the discriminant is lesser than zero. This implies that the equation has no real roots.

For Option D:

f(x) = –4x² + 9x

a = –4

b = 9

c = 0

Discriminant = b² – 4ac

Discriminant = 9² – (4 × –4 × 0)

Discriminant = 81 – 0

Discriminant = 81

Thus, the discriminant is greater than zero. This implies that the equation has two real roots.

Summary:

Option A : Only one real root.

Option B : Two real roots.

Option C : No real roots.

Option D : Two real roots.

The correct answer is option A.

3 0

3 years ago

An alarming number of U.S. adults are either overweight or obese. The distinction between overweight and obese is made on the ba

sladkih [1.3K]

Answer:

(a) The probability that a randomly selected adult is either overweight or obese is 0.569.

(b) The probability that a randomly selected adult is neither overweight nor obese is 0.431.

Step-by-step explanation:

Let <em>A</em> = a person is over weight and <em>B</em> = a person is obese.

The information provided is:

An adult is considered overweight if the BMI ≥ 25 but BMI < 30.

An obese adult will have a BMI ≥ 30.

According to the range of BMI the events A and B are independent.

P (A) = 0.331 and P (B) = 0.357.

(a)

Compute the probability that a randomly selected adult is either overweight or obese as follows:

P (A ∪ B) = P (A) + P (B) - P (A ∩ B)

= P (A) + P (B) - P (A)×P (B)

$=0.331+0.357-(0.331\times0.357)\\=0.569833\\=0.569$

Thus, the probability that a randomly selected adult is either overweight or obese is 0.569.

(b)

Compute the probability that a randomly selected adult is neither overweight nor obese as follows:

$P(A^{c}\cup B^{c})=1-P(A\cup B)=1-0.569=0.431$

Thus, the probability that a randomly selected adult is neither overweight nor obese is 0.431.

4 0

4 years ago

Dale wants to rent a boat and spend at most $52. The boat costs $7 per hour, and Dale has a discount coupon for $4 off.

zzz [600]

Answer: 3 dollars

Step-by-step explanation:

4 0

4 years ago

Read 2 more answers