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3 years ago

Plz help give brainliest

Mathematics

1 answer:

Lelu [443]3 years ago

8 0

The equation $ax^2+bx+c=0$ has it's solutions given by $x= \frac{-b \pm \sqrt{b^2-4ac}}{2a}$ . This is the quadratic formula.

Looking at your equation we see a=1; b=-3 and c=-6 so by the quadratic formula,
$x = \frac{-(-3) \pm \sqrt{(-3)^2-(4 \times 1 \times -6)}}{2 \times 1} = \frac{3 \pm \sqrt{9+24}}{2}$

I'm sure you can work out what 9+24 is and so find the correct option :)

You might be interested in

A carpenter has boards of lengths 24, 40, and 48 inches that must be cut into smaller boards of equal length, with no scrap wood

bulgar [2K]

It would be 8 inches, because for this you just have to find the greatest common factor between all three numbers which is 8

5 0

3 years ago

Convert the fraction to higher terms. Enter the value of the missing numerator. 7/10=?/50

Crazy boy [7]

Answer: 7/10=35/50

Step-by-step explanation:

1. To get 50, you had to multiply 10 by 5, so do the same to the numerator, 7.

2. 7*5=35.

7 0

2 years ago

Read 2 more answers

Question

puteri [66]

Answer:

The salt concentration of the mixed solution = 10%

Step-by-step explanation:

First assuming that the concentration of salt given is on a vol% basis.

First solution has 0.7 gallon of 5% salt

Amount of salt in this solution = 5% × 0.7 = 0.035 gallon

Second solution has 0.3 gallon of 22% salt

Amount of salt in this solution = 22% × 0.3 = 0.066 gallon

Total amount of salt in the resulting solution = 0.035 + 0.066 = 0.101 gallon

Total volume of the resulting solution = 0.7 + 0.3 = 1.00 gallon

Concentration of the mixture of salt = (0.101/1) = 0.101 = 10.1% = 10% to the nearest percent

Hope this Helps!!!

3 0

3 years ago

In a certain city district the need for money to buy drugs is stated as the reason for 70% of all thefts. Find the probability t

torisob [31]

Answer:

9.72% probability that among the next 7 theft cases reported in this district, exactly 3 of them resulted from the need to buy drugs.

Step-by-step explanation:

For each theft, there are only two possible outcomes. Either the need to buy drugs is the reason of the theft, or it is not. Each theft is independent of each other. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

In a certain city district the need for money to buy drugs is stated as the reason for 70% of all thefts.

This means that $p = 0.7$

Find the probability that among the next 7 theft cases reported in this district, exactly 3 of them resulted from the need to buy drugs.

This is P(X = 3) when n = 7. So

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 3) = C_{7,3}.(0.7)^{3}.(0.3)^{4} = 0.0972$

9.72% probability that among the next 7 theft cases reported in this district, exactly 3 of them resulted from the need to buy drugs.

5 0

2 years ago

What is the correct answer NEED ASAP PLEASE

Rudik [331]

Answer:

1 solution

Step-by-step explanation:

x^2 - 14x + 49 = 0

Factor the expression:

x - 7

------------------------

x | x^2 | - 7x |

- ------------------------

7 | - 7x | 49 |

------------------------

(x - 7)^2 = 0

x - 7 = 0

x = 7

8 0

2 years ago