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3 years ago

Find the distance between the points (13, 20) and (18, 8). 13 7 11

Mathematics

1 answer:

Lana71 [14]3 years ago

5 0

Answer: 13

Step-by-step explanation:

See attached graph.

A third point (18,20) may be added to the two given points to form a right triangle with sides 5 and 12. The distance, x, between the original two points is given by x^2 = 5^2 + 12^2

x^2 = 25 + 144

X^2 = 169

x = 13

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The grid model expressed as a ratio of shaded squares to total squares is _____

fredd [130]

Answer:

1 = 25/50

2 = 1/2

3 = 0.50

4 = 50%

Step-by-step explanation:

i got it right on edg and i hope it helps :)

4 0

3 years ago

Can someone please tell me how to solve this? I have the picture of the question.. 8-9x/3

nirvana33 [79]

So, u can separate these by using 3 as the common denominator. So, it is 8/3 - 9x/3. Simplified, 8/3-3x.

3 0

3 years ago

Y = x2 + 7x – 5 can be written in the form y = (x + a)2 + b. Find the value of a and the value of b.

Gala2k [10]

Answer:

$a = \frac{7}{2}$ and $b = \frac{-69}{4}$

Step-by-step explanation:

Given

$y = x^2 + 7x - 5$

Required:

Write as:

$y = (x + a)^2 + b$

Determine the values of a and b

$y = x^2 + 7x - 5$

$y = (x + a)^2 + b$

Expand

$y = x^2 + 2ax + a^2 + b$

So, we have:

$y = x^2 + 2ax + a^2 + b$

$y = x^2 + 7x - 5$

By comparison:

$2ax = 7x$

$a^2 + b = -5$

Solve for x in: $2ax = 7x$

$2a = 7$

Divide through by 2

$a = \frac{7}{2}$

Substitute $a = \frac{7}{2}$ in $a^2 + b = -5$

$(\frac{7}{2})^2 + b = -5$

$\frac{49}{4}+ b = -5$

Make b the subject

$b = -5 -\frac{49}{4}$

$b = \frac{-20-49}{4}$

$b = \frac{-69}{4}$

3 0

3 years ago

Use △DEF, shown below, to answer the question that follows: Triangle DEF where angle E is a right angle. DE measures x. DF measu

Nonamiya [84]

Answer:

36.08

Step-by-step explanation:

Side DE is the side adjacent to ∠D. Side DF is the hypotenuse of the triangle. Adjacent/hypotenuse is the ratio for cosine; this gives us the equation

$\cos{49}=\frac{x}{55}$

To solve this, multiply both sides by 55:

$55\times \cos{49}=\frac{x}{55}\times 55\\\\55\cos{49}=x\\\\36.07=x$

4 0

3 years ago

Read 2 more answers

They always giving me hard questions

Marianna [84]

The answer is 336.96. The are of a circle is A=3.14 * r^2. When you plug in your radius (12) you get 449.28. you then multiply the answer you just got with 0.75. Which gets you the answer 336.96. round if you need too <span />

4 0

3 years ago