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3 years ago

Which point should Polly connect to point E to make a 30° angle?

Mathematics

2 answers:

Grace [21]3 years ago

8 0

Answer:

Step-by-step explanation:

If she connects it to any other point the angle would be more then 30 degrees.

Vikentia [17]3 years ago

8 0

How To Construct A 30 Degree Angle. A 30° angle is half of a 60° angle. So, to draw a 30° , construct a 60° angle and then bisect it.

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Prove that root 7 is irrational by the method of contradiction

Alchen [17]

Let assume that $\sqrt7$ is a rational number. Therefore it can be expressed as a fraction $\dfrac{a}{b}$ where $a,b\in\mathbb{Z}$ and $\text{gcd}(a,b)=1$ .

$\sqrt7=\dfrac{a}{b}\\\\7=\dfrac{a^2}{b^2}\\\\a^2=7b^2$

This means that $a^2$ is divisible by 7, and therefore also $a$ is divisible by 7.

So, $a=7k$ where $k\in\mathbb{Z}$

$(7k)^2=7b^2\\\\49k^2=7b^2\\\\7k^2=b^2$

Analogically to $a^2=7b^2$ ------- $b^2$ is divisible by 7 and therefore so is $b$ .

But if both numbers $a$ and $b$ are divisible by 7, then $\text{gcd}(a,b)=7$ which contradicts our earlier assumption that $\text{gcd}(a,b)=1$ .

Therefore $\sqrt7$ is an irrational number.

8 0

3 years ago

Suppose that 21 inches of wire costs 63 cents.

defon

Answer:

162 cents

Step-by-step explanation:

to find the rate you want take the inches which is 21 and divide by the cost which is 63 and find the rate is 3 which means each inch costs 3 cents and so with that rate you can find the cost of 54 inchest of wire so you take your 54 inches and multiply it by 3 which is the cents per inch and find that 54 inches of wire would cost you 162 cents

6 0

2 years ago

In humans, which set of chromosomes do males have? Ο Α. ΥΥ OOO O D. XYY

Kisachek [45]

Males have chromosome pairs of (XY) and Females have chromosome pairs of (XX)

4 0

3 years ago

this one is really hard

crimeas [40]

Answer:

142

Step-by-step explanation:

opposite angle theorem

5 0

2 years ago

Read 2 more answers

Can anyone help? Will give Brainly and 45 pts <3

sashaice [31]

Solving this involves substitution of values into the given formula and applying basic arithmetic.

Weight of Car is 2.1 tons

We are told that the dimensions of the rectangle are 7in and 5in.

Formula for area of a rectangle is;

A = Length x breadth

Thus;

A = 7 × 5

A = 35 in²

We are also given;

Air pressure; P = 30 psi

A car has 4 tires and so;

Number of tire; N = 4

We are told that formula for weight of the car in ton is;

W = APN/2000

Plugging in the relevant values;

W = (35 × 30 × 4)/2000

W = 2.1 tons

Read more at; brainly.com/question/2926797

6 0

2 years ago

Read 2 more answers