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3 years ago

HELP...... which is a solution of the equation? 2x - y = 0

Mathematics

1 answer:

Lena [83]3 years ago

6 0

All we need to do is plug the numbers into the equation.

$2(3)--1=0\\6--1=0\\7\neq0$

Not A.

$2(2)--4=0\\4--4=0\\8\neq0$

Not B.

$2(1)-2=0\\0=0$

C is the correct answer

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ΔABC has three sides with these lengths: AB = 9, BC = 40, and CA = 41. What is the value of cos C?

kotykmax [81]

Answer:

$cos(C) =\frac{40}{41}\\\\cos(C)=0.976$

Step-by-step explanation:

To find the $cos (C)$ we must use the cosine theorem.

The cosine theorem says that:

$c^2 = a^2 +b^2 -2abcos(C)$

In this case:

$c=AB = 9$

$b=CA = 41$

$a=BC = 40$

$9^2 = 40^2 +41^2 -2(40)*(41)cos(C)$

$9^2- 40^2- 41^2 =-2(40)*(41)cos(C)$

$cos(C) = -\frac{9^2- 40^2- 41^2}{2(40)*(41)}$

$cos(C) =\frac{40}{41}\\\\cos(C)=0.976$

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3 years ago

A baker is using two circular pans. the Larger pan has a diameter of 12 inches The smaller pan has a diameter of 7 inches. How m

mr Goodwill [35]

Hey there,

The answer is 15.7 inches

Hope I helped

7 0

4 years ago

WHATS THE PERIMITER PLS HELP ME

mihalych1998 [28]

I believe the answer is c

4 0

3 years ago

Lim

insens350 [35]

Answer:

Step-by-step explanation:

f(-9+h)= (-9+h)² = h²-18h+81

f(-9+h)-f(-9)=h²-18h+81 -81 because : f(-9) = (-9)² = 81

f(-9+h)-f(-9)=h²-18h

(f(-9+h)-f(-9))/h=(h²-18h)/h = h(h-18)/h =h-18

lim (f(-9+h)-f(-9))/h = lim(h-18= - 18

h→0 h→0

4 0

4 years ago

Find the LCM of the set of numbers: 9, 13

expeople1 [14]

Answer:

117

Step-by-step explanation:

prime factors of 9 are 3 and 3

prime factor of 13 is 13

multiply them

8 0

3 years ago