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igor_vitrenko [27]

3 years ago

13

If my homework for Maths Watch isn't appearing, what is the cause of it. A. Because the teacher hasn't set the task yer or, B wh

ich is there is something wrong with my maths watch?

1 answer:

Simora [160]3 years ago

5 0

A. Pretty sure :)) !!

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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 $4 \sqrt{5}$ .

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3 years ago

What is the value of y in the equation 9 + y = 8? this is extremely time sensitive

adoni [48]

You have to switch the 8 to the left and the y to the right which would change the equation to 9-8=y

y=1

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<em>*To solve for a specified variable, you need to isolate that variable onto one side.</em>

<h3>11.</h3>

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Lastly, divide both sides by 2 and <u>your answer will be $p=\frac{1}{2}q-\frac{5}{2}r$ </u>

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First, subtract z on both sides of the equation: $-10-z=xy$

Next, divide both sides by y and <u>your answer will be $\frac{-10-z}{y}=x$ </u>

<h3>13.</h3>

Firstly, multiply both sides by b: $a=cb$

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If a line contains the point (0, -1) and has a slope of 2, then which of the following points also lies on the line?

alexgriva [62]

Answer:

b

Step-by-step explanation:

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A frozen pizza is on sale at a 25% discount. Find the sales price of the pizzas if it normally sells for $4.85.

bonufazy [111]

The best thing to do here is to divide $4.85 by 10, and then multiply it by 2.5. $4.85/10= $0.48. $0.48x2.5= $1.20 Therefore,the discount is $1.20, you've then got to subtract this from $4.85. $4.85-$1.20= $3.65 $3.65 is the sale price of the pizza. Hope this helps :)

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