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3 years ago

I need help with a and b

Mathematics

1 answer:

mash [69]3 years ago

4 0

Answer:

=8×12

8=2×4

4=2×2

=12

2×6

6=2×3

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DochEvi [55]

2x²+8x-90 = 2(x-5)(x+9)

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4 years ago

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How big is the home field advantage in the National Football League (NFL)? To investigate, we select a sample of 80 games from t

ElenaW [278]

Answer:

0.74 to 6.06

Step-by-step explanation:

The groups are independnet,

SE(xh bar-xa bar)=sqrt [sh^2/nh+sa^2/na]=sqrt [10.1^2/80+10.3^2/80]=1.61

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3 years ago

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saveliy_v [14]

5. Answer: see explanation

Step-by-step explanation:

If the roots are m and 3m, then x = m and x = 3m

⇒ x - m = 0 and x - 3m = 0

⇒ (x - m)(x - 3m) = 0

⇒ x² - 4mx + 3m² = 0

Since x² + px + q = 0 then p = -4m and q = 3m²

3p² = 3(-4m)² 16q = 16(3m²)

= 3(16m²) = 48m²

= 48m²

3p² = 48m² = 16q ⇒ 3p² = 16q

**********************************************************************************************

6. Answer: 8 or 18

Step-by-step explanation:

The Area of the entire rectangle (A = L × w) is 12 × 10 = 120

The Area of the shaded region is 72, so the Area of the non-shaded region is 120 - 72 = 48.

There are two non-shaded triangles.

Bigger non-shaded Δ: L = 12-x, w = 10 ⇒ $A = \dfrac{10(12-x)}{2}$
Smaller non-shaded Δ: L = x, w = x ⇒ $A=\dfrac{x(x)}{2}$

Combine the Areas of both triangles and set it equal to the Area of the non-shaded region:

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Area of ΔBEF:

$\text{when x = 4, A =}\ \dfrac{4(4)}{2}=\dfrac{16}{2}=8\\\\\\\text{when x = 6, A =}\ \dfrac{6(6)}{2}=\dfrac{36}{2}=18$

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3 years ago

Find the volume of a cylinder with a radius of 3" and a height of 12"

Natalija [7]

Here's the formula you need to use:

The volume of any cylinder is = (pi) x (radius)² x (height) .

Take that formula.
Write your "3 inches" in place of "radius".
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Write "3.14" in place of "pi".
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Answer:

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3 years ago