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3 years ago

On a standardized exam, the scores are normally distributed with a mean of 300 and

Mathematics

1 answer:

Misha Larkins [42]3 years ago

8 0

Answer:

-1.5

Step-by-step explanation:

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Which phrase represents the meaning of the symbol ?

NeTakaya

Answer:

C. Greater than.

Step-by-step explanation:

5 0

3 years ago

Write the equation of the parabola that has its x-intercepts at (1+<img src="https://tex.z-dn.net/?f=%5Csqrt%7B5%7D" id="TexForm

VladimirAG [237]

Answer:

$y=2x^2-4x-8$

Step-by-step explanation:

Factored form of a parabola

$y=a(x-p)(x-q)$

where:

p and q are the x-intercepts.
a is some constant.

Given x-intercepts:

(1+√5, 0)
(1-√5, 0)

Therefore:

$\implies y=a(x-(1+\sqrt{5}))(x-(1-\sqrt{5}))$

$\implies y=a(x-1-\sqrt{5})(x-1+\sqrt{5})$

To find a, substitute the given point (4, 8) into the equation and solve for a:

$\implies a(4-1-\sqrt{5})(4-1+\sqrt{5})=8$

$\implies a(3-\sqrt{5})(3+\sqrt{5})=8$

$\implies4a=8$

$\implies a=2$

Therefore, the equation of the parabola in factored form is:

$\implies y=2(x-1-\sqrt{5})(x-1+\sqrt{5})$

Expand so that the equation is in standard form:

$\implies y=2(x^2-x+\sqrt{5}x-x+1-\sqrt{5}-\sqrt{5}x+\sqrt{5}-5)$

$\implies y=2(x^2-x-x+\sqrt{5}x-\sqrt{5}x+\sqrt{5}-\sqrt{5}+1-5)$

$\implies y=2(x^2-2x-4)$

$\implies y=2x^2-4x-8$

6 0

1 year ago

Big announcement I just got a 100 on the hardest test this semester it took me 2 hors so i will be giving away 100 points and pl

Andreas93 [3]

Answer:

GGs good job!!!!!!

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

25 points

Andrei [34K]

Answer:

34 + x = 70 ; 36

Step-by-step explanation:

Given that:

Current amount = 34

Final amount = 70

Number of roses planted by the workers today ;

Current amount + number planted today = final amount

Let number planted today = x

34 + x = 70

x = 70 - 34

x = 36

7 0

3 years ago

Which of the following sets shows all the numbers from the set {1, 2.5, 3, 4.5, 5} that make the inequality 3a + 4 ≥ 13 true?

zmey [24]

3(1)+4≥ 13
7≥ 13
No

3(2.5)+4≥ 13
11.5≥ 13
No

3(3)+4≥ 13
13≥ 13
Yes

{3, 4.5, 5}

3 0

3 years ago

Read 2 more answers