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3 years ago

Pls help for math class

Mathematics

2 answers:

anastassius [24]3 years ago

8 0

Answer: 6y - 4

(-y + 5) + (7y - 9)

= (7y - y) + (5 - 9)

= 6y - 4

Step-by-step explanation:

Mashutka [201]3 years ago

6 0

Answer:

6y-4

Step-by-step explanation:

to solve this we are going to combine like terms using pemedas and other mathematical properties.

using the associative property, we know that we can rearrange the groupings of the parenthases

-y+5+7y-9

so now we are going to combine like terms

this leaves us with a final answer of

6y-4

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If when simplified results to a unit fraction and

tangare [24]

Answer:

a ≤ 39 ≠ 1

Step-by-step explanation:

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2 years ago

The ratio of the perimeters of two similar triangles is 4:7. What is the area of each of these triangles if the sum of their are

Mashcka [7]

Answer:

The area of triangles are 16 cm^2 and 49 cm^2

Step-by-step explanation:

we know that

If two figures are similar, the ratio of its perimeters is equal to the scale factor and the ratio of its areas is equal to the scale factor squared

Let

z ----> the scale factor

x ----> the area of the smaller triangle in square centimeters

y ----> the area of the larger triangle in square centimeters

we know that

$z=\frac{4}{7}$

$\frac{x}{y}=z^2$

$\frac{x}{y}=(\frac{4}{7})^2$

$\frac{x}{y}=\frac{16}{49}$

$x=\frac{16}{49}y$ -----> equation A

$x+y=65$ ----> equation B

solve the system by substitution

substitute equation A in equation B

$\frac{16}{49}y+y=65$

solve for y

$\frac{65}{49}y=65$

$y=49\ cm^2$

Find the value of x

$x=\frac{16}{49}(49)$

$x=16\ cm^2$

therefore

The area of triangles are 16 cm^2 and 49 cm^2

3 0

4 years ago

Read 2 more answers

A=42°, b=10, c=12. What is the length of a to the nearest tentH

Digiron [165]

The length of a in the triangle to the nearest tenth is 8.1 units.

<h3>How to find side of a triangle?</h3>

The side a of the triangle can be found using cosine formula.

Therefore,

a²= b² + c² - 2bc cos A

a² = 10² + 12² - 2 × 10 × 12 cos 42°

a² = 100 + 144 - 240cos 42

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a = √65.6453

a = 8.10217871933

a = 8.1

learn more on triangle here: brainly.com/question/7831188

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igomit [66]

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It takes Lara 1/3 hour to walk to the library 3/4 mile away. What is her walking pace?

Dmitry [639]

2 1/4 miles per hour.

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