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exis [7]
3 years ago
8

Solve the equation below for the exact values of 4x2-5=75 ​

Mathematics
1 answer:
Gala2k [10]3 years ago
3 0

Answer:

x = ± 2\sqrt{5}

Step-by-step explanation:

Given

4x² - 5 = 75 ( add 5 to both sides )

4x² = 80 ( divide both sides by 4 )

x² = 20 ( take the square root of both sides )

x = ± \sqrt{20}

  = ± \sqrt{4(5)}

  = ± 2\sqrt{5}

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What is the solution to the equation 3 + = 4? y = y = y = 1 y = 4
kvv77 [185]

Answer:

y = 1

Step-by-step explanation:

3 + y = 4

y = 1

6 0
3 years ago
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Write 0 in the ten thousands place. What is its value? Explain how<br> you know.
4vir4ik [10]

Answer:

00.

Step-by-step explanation:

because it suppose to be a 0.

4 0
3 years ago
B) Given that BC = 5 cm,<br>work out the perimeter of the triangle.<br>​
Eva8 [605]

Answer:

perimeter BC=5

PERIMETER = THE SIDES OR SURFACE

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6 0
3 years ago
Sin 30°-cos 30°÷ sin 60°<br><br>​
Vilka [71]

Answer:

-1/2

Step-by-step explanation:

sin(30 degrees) = sin (pi/6) = 1/2

cos(30 degrees) = cos (pi/6) = [sqrt(3)]/2]

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6 0
2 years ago
An urn contains 12 balls, of which 4 are white.
wel

Answer:

a) \frac{1}{3}

b) \frac{4}{12}\,,\,\frac{4}{11}\,,\,\frac{4}{10}\,,...

Step-by-step explanation:

Number of balls in the urn = 12

Number of white balls in the urn = 4

So, number of balls which are not white = 12 - 4 = 8

We know that probability = No. of outcomes/Total number of outcomes

Let A_i\,,\,B_i\,,\,C_i denotes the event of getting white ball by A, B and C

a) each ball is replaced after being drawn.

Probability = Number of white balls/Total number of balls

Solution: P(A_i)=P(B_i)=P(C_i)=\frac{4}{12}=\frac{1}{3}

b)the balls that are withdrawn are not replaced.

Solution:

If A wins: P(A_1)=\frac{4}{12}=\frac{1}{3}

If A lost and B wins: P\left ( B_1|A_1^{c} \right )=\frac{4}{11}

If A and B lost and C wins: P\left ( C_1|A_1^{c}\,B_1^{c} \right )=\frac{4}{10}

and so on....

4 0
4 years ago
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