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3 years ago

How do you do solve this problem

Mathematics

1 answer:

Damm [24]3 years ago

8 0

Answer:

Step-by-step explanation:

1cm = 10mm

Therefore 8cm = 8 · 10mm = 80mm

The scale of the model

$\dfrac{model}{real}\to\dfrac{80}{0.43}=\dfrac{80\cdot100}{0.43\cdot100}=\dfrac{8000}{43}\approx186$

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Solve for x: 2 over 5 (x − 2) = 4x. (1 point) 2 over 9 9 negative 2 over 9 negative 9 over 2

Natalka [10]

<u>ANSWER</u>

$x = - \frac{2}{9}$

<u>EXPLANATION</u>

The given equation is :

$\frac{2}{5}(x - 2) = 4x$

We multiply both sides by $\frac{5}{2}$

$\frac{5}{2} \cdot\frac{2}{5}(x - 2) = 4x \times \frac{5}{2}$

We simplify to obtain:

$x - 2 = 10x$

Group similar terms to obtain:

$- 2 = 10x - x$

Simplify the right hand side.

$- 2 = 9x$

Divide both sides by 9.

$\frac{ - 2}{9} = \frac{9x}{9}$

$- \frac{2}{9} = x$

$x = - \frac{2}{9}$

The second choice is correct

8 0

3 years ago

An item was marked down 64% from its original price, x. The amount discounted was $30. Which equation can be

mihalych1998 [28]

Answer:

0.64(x) = 30

Step-by-step explanation:

Hope that's correct.

3 0

3 years ago

ahmets sister gives him $2 on monday and promises to double the previous day's amount every day this week. what is the total amo

777dan777 [17]

Answer

$10

Step-by-step explanation:

So the answer is 10 because

count by two starting form Monday to Friday

Let me know if I did something wrong.

5 0

3 years ago

Read 2 more answers

Which on is the correct answer

Xelga [282]

Answer:

y=-x-5

Step-by-step explanation:

Slope is the x, since slope is equal to -1, x=-1. For the y intercept you simply add or subtract the number given to you, since it is -5 you would add a -5 to the end of the equation

4 0

3 years ago

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A box contains 15 resistors. twelve of them are labelled 50ω and the other three are labeled 100ω. what is the probability that

Igoryamba

Answer : P(second resistor is 100ω , given that the first resistor is 50ω) is given by

$\frac{1}{5}$

Explanation :

Since we have given that

Total number of resistors =15

Number of resistors labelled with 50ω = 12

Number of resistors labelled with 100ω =3

Let A: Event getting resistor with 50ω

B: Event getting resistor with 100ω

Since A and B are independent events .

So,

$P(A\cap B)=P(A).P(B)$

Now, According to question , we can get that

$P(A)= \frac{12}{15}=\frac{4}{5}\\\\P(B)=\frac{3}{15}=\frac{1}{5}$

So,

$P(A\cap B)=P(A).P(B)\\\\P(A\cap B)=\frac{4}{5}\times \frac{1}{5}\\\\P(A\cap B)=\frac{4}{25}$

So, by using the conditional probability , which state that

$P(B\mid A)=\frac{P(A\cap B)}{P(A)}$

$P(B\mid A)=\frac{\frac{4}{25}}{\frac{4}{5}}\\\\P(B\mid A)=\frac{5}{25}\\\\P(B\mid A)=\frac{1}{5}$

So, P(second resistor is 100ω , given that the first resistor is 50ω) is given by

$\frac{1}{5}$

4 0

4 years ago