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3 years ago

HELP!! PLEASE!!! THANK YOU!!

Mathematics

1 answer:

Blizzard [7]3 years ago

6 0

Answer:

C. 8x - 3y = 5

Step-by-step explanation:

7 - 3(x - y) = 5x + 2

Standard form: Ax + By = C

7 -3x + 3y = 5x + 2

7 -8x + 3y = 2

-8x + 3y = -5

Divide by -1 to each number

8x - 3y = 5

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At Tech High there are three math teachers, Mary, Tom, and Alex. All students at Tech High take math, with 21% taking class with

galben [10]

Answer:

The probability that a Tech High student fails math is 0.1006

Step-by-step explanation:

21% students are taking class with Mary.

Every year 4% of Mary’s students fail,

15% students are taking class with Tom

Every year 6% of Tom’s students fail.

64% students are taking class with Alex

Every year 13% of Alex's students fail.

Now we are supposed to find the probability that a Tech High student fails math.

$P(\text{Tech High student fails math}) = P(\text{taking class with Mary})\times P(\text{Mary students fail})+P(\text{taking class with Tom}) \times P(\text{Tom students fail})+P(\text{taking class with Alex}) \times P(\text{Alex student fail})$

$P(\text{Tech High student fails math}) = 0.21 \times 0.04+0.15 \times 0.06+0.64 \times 0.13$

$P(\text{Tech High student fails math}) =0.1006$

Hence the probability that a Tech High student fails math is 0.1006

8 0

4 years ago

What is the area of the triangle? Use the formula: Area of a triangle = 1/2bh.How do you find the area of a triangle?

velikii [3]

9514 1404 393

Answer:

4 square inches

Step-by-step explanation:

The only triangle in the figure is 4 in wide and 2 in high. Using these values in the given formula, we find the area to be ...

A = 1/2bh

A = (1/2)(4 in)(2 in) = 4 in²

The area of the triangle is 4 square inches.

4 0

3 years ago

Whats 1/7 divided by 2/5

Marianna [84]

Answer:

Step-by-step explanation:

(1/7) / (2/5)

when dividing fractions, flip what u r dividing by, then multiply

1/7 * 5/2 = 5/14 <==

8 0

3 years ago

The function d(t)=300,000t represents the distance (in kilometers) that light travels in t seconds.

Korolek [52]

Answer:

a. The light travels 4,500,000 kilometers in 15 seconds

b. It takes the light 40 seconds to travel 12 million kilometers

Step-by-step explanation:

- The function d(t) = 300,000 t represents the distance in kilometers

that light travel in t seconds

- We need to find how far the light travels in 15 seconds

∵ d(t) = 300,000 t

∵ t = 15 seconds

- Substitute the value of t in the function above

∴ d(t) = 300,000 (15)

∴ d(t) = 4,500,000 kilometers

<em>The light travels 4,500,000 kilometers in 15 seconds</em>

- We need to find how long does it takes the light to travel 12 million

kilometers

∵ d(t) = 12 million kilometers = 12,000,000 km

∵ d(t) = 300,000 t

- Substitute the value of d(t) in the function

∴ 12,000,000 = 300,000 t

- Divide both sides by 300,000

∴ t = 40 seconds

<em>It takes the light 40 seconds to travel 12 million kilometers</em>

3 0

3 years ago

Solve for x 2(3x+5)=22

galben [10]

Answer:

Step-by-step explanation:

multiply 2 with right hand equation

6x+10=22

6x=22-10

6x=12

x= 12/6

x=2 answer

8 0

4 years ago

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