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3 years ago

A student performed the following steps to find the solution to the equation

Mathematics

1 answer:

PSYCHO15rus [73]3 years ago

5 0

Answer:

Step 2

Step-by-step explanation:

Step 2 because in step 1, they correctly wrote the factors of the polynomial as (x+6) and (x-2). But then in step 2, (x+6) suddenly became (x-6) and (x-2) became (x+2), which is incorrect.

The answers in step 3 should have been -6 and 2.

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One positive number exceeds three times another positive number by 5. The product of the two numbers is 68. Find the number

kati45 [8]

Answer:12

Step-by-step explanation:

Let the numbers be a and b

a-3b=5 ........equation (1)

There product is :

ab=68 ..........equation (2)

From equation (1)

a-3b=5

Make a the subject of the formula

a=5+3b. ........equation (3)

Substitute equation (3) into equation (2)

(5+3b)b=68

3(b^2)+3b-68=0

The product is -204b^2(17 and -12)

(b+17)(b-12)=0

b=-17 or b=12

So the number is 12

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4 years ago

WILL GIVE BRAINLIEST!!!!!

Phoenix [80]

It’s either A or B but I would choose B as the correct answer

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3 years ago

ILL GIVE BRAINILEST: Write an equation for the triangle and solve the equation to find the value of the variable then find the a

weqwewe [10]

Answer:

q=36

Step-by-step explanation:

Equation: 3q+q+q=180

180 degress in a triangle. Solve the equation and you end up with q=36

Boom.

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3 years ago

1.<br> What is the solution to the equation x+3(x-5)=9

solmaris [256]

Answer:

PEMDAS

Step-by-step explanation:

PEMDAS

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3 years ago

Read 2 more answers

At a peace summit, seven Hatfield and nine McCoy family

katrin2010 [14]

Answer:

0.525 = 52.5% probability that the two are from different families.

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

In this problem, the order in which the two participants are selected is not important, so we use the combinations formula to solve this question.

Combinations formula:

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

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

Desired outcomes:

1 from the Harfield family(from a set of 7).

1 from the McCoy family(from a set of 9). So

$D = C_{7,1}*C_{9,1} = \frac{7!}{1!6!}*\frac{9!}{1!8!} = 7*9 = 63$

Total outcomes:

2 from a set of 16. So

$T = C_{16,2} = \frac{16!}{2!14!} = 120$

Probability:

$p = \frac{D}{T} = \frac{63}{120} = 0.525$

0.525 = 52.5% probability that the two are from different families.

3 0

3 years ago