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3 years ago

HELP ASAP. thank u :)

Mathematics

1 answer:

lana [24]3 years ago

8 0

The Slope of your line would be -3, and your Y-intercept would be 9. Therefore your answer would be B. Slope = -3, Y-intercept 9.

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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

Which property is illurstaed by this problem. (6.3x)y=6.3(xy)

Sergio [31]

Its the identity property

6 0

3 years ago

Put 8y-4x=56 in slope intercept form

quester [9]

Answer:

slope intercept form: y=1/2(x)+7

Step-by-step explanation:

slope intercept form is written as y=mx+b

on a graph, the equation y=8y-4x=56 goes through the "x" axis at point (-14,0) and the goes through the "y" axis at point (0,7)

6 0

3 years ago

O<br> If the sin 90° is 1, then the cos<br> (4 points

stepan [7]

Answer:

What is the angle for cos, keep question clearly

If angle is 90° then answer is 0

3 0

2 years ago

PLZZZZZZZZZZZZ HELP!?!?!??!?!?!<br> What is the length of BC¯¯¯¯¯ ?

olganol [36]

According to the markings, BD = DC. From this fact

BD = DC

BD + DC = BC

18 + 18 = BC

BC = 36 <<<<<< Answer

4 0

3 years ago

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