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3 years ago

Help me pleaseeeeeeeee

Mathematics

2 answers:

topjm [15]3 years ago

7 0

Answer:

x = 6, y = 3

Step-by-step explanation:

Let Sally's age be x and Tomas's age be y.

Sum of Sally's age plus twice Tomas's age: x + 2y = 12

Difference of Sally's age and Tomas's age: x - y = 3

Multiply the second equation by two and add it to the first equation to get

3x = 18, which means x = 6.

Plug 6 in for x in the second equation to get 6 - y = 3, which means y = 3.

natka813 [3]3 years ago

3 0

Answer:

Step-by-step explanation:

its EZY

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29. A DVD player has a list price of $120. The

kvv77 [185]

Answer:

$90

Step-by-step explanation:

First the given is the listed price of DVD which is 120 dollars.

Now we need to find out what the price will be after discount of 25%

To do this we will have to convert the percentage to decimal by moving decimal 2 place left and removing percentage sign which will become 0.25.

Then we multiply by the listed price which is 120

so 120*0.25=30

so we subtract 30 by original price cause that is the discount off we are receiving

120-30=90

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3 years ago

Find x<br><br>(a+3)² - 25 = 0

DanielleElmas [232]

Take the square root of the entire thing for get rid of square, then solve for a

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3 years ago

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Radda [10]

170^3 this is the answer just make sure you do you're work.

7 0

3 years ago

Given right triangle ABC with altitude BD drawn to hypotenuse AC. If AC =16 and DC=5 what is the length of BC in the simplest ra

Nana76 [90]

The length of BC is $4 \sqrt{5}$ .

Solution:

Given ABC is a right triangle.

AC is the hypotenuse and BD is the altitude.

AB and BC are legs of the triangle ABC.

AC = 16 and DC = 5

<u>Leg rule of geometric mean theorem:</u>

$\frac{\text { hypotenuse }}{\text { leg }}=\frac{\text { leg }}{\text { part }}$

$\Rightarrow \frac{AC}{BC}=\frac{BC}{DC}$

$\Rightarrow \frac{16}{x}=\frac{x}{5}$

Do cross multiplication.

$\Rightarrow 16\times 5 = x\times x$

$\Rightarrow 80= x^2$

$\Rightarrow 16\times 5= x^2$

Taking square root on both sides.

$\Rightarrow \sqrt{16\times 5} = \sqrt{x^2}$

$\Rightarrow \sqrt{4^2\times 5} = \sqrt{x^2}$

square and square roots get canceled, we get

$\Rightarrow 4\sqrt{ 5} = x$

The length of BC is $4 \sqrt{5}$ .

7 0

3 years ago

Some friends played a board game. During the game, one unlucky player had to move back 8 spaces 5 turns in a row. Find a number

mojhsa [17]

Answer:

I think that it would be -40

Step-by-step explanation:

I think this because they had to go back 40 spaces because 8 x 5 = 40.

7 0

3 years ago