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AnnZ [28]
1 year ago
12

This is k 12 help, please!!! for (100 points)

Mathematics
2 answers:
Gennadij [26K]1 year ago
6 0

Answer:

14 m²

area of sqaure pyramid: a² + 2(a)(l)

  • a = side of the base
  • l = slant height

area:

  • (2)² + 2(2)(2.5)
  • 14 m²
Vlad1618 [11]1 year ago
3 0

Answer:

3rd option - 14 m²

Step-by-step explanation:

First we know that the square's area will be 2×2 = 4

To calculate the area of a triangle we know the vertical height is 2.5 and the base length is 2 so we can use the formula b×h/2 to give the area of one triangle:

2.5×2 = 5

5÷2 = 2.5

So the area of 1 triangle is 2.5 m²

Since there are 4 triangles we multiply the area of 1 traingle by 4:

2.5×4 = 10

We add the area of the 4 triangles to the area of the square to give our final answer of :

10 + 4 = 14

14 m²

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Write the explicit formula for the geometric sequence.<br><br> a1 = -5 a2 = 20 a3 = -80
Anni [7]
a_1 = -5;\ a_2 = 20;\ a_3 = -80 \\\\a_2:a_1=r\ and\ a_3:a_2=r\\\\r=20:(-5)=-4\ check\ r=-80:20=-4\\\\a_n=a_1r^{n-1}\to a_n=-5\cdot(-4)^{n-1}=-5\cdot(-4)^{-1}\cdot(-4)^n\\\\=-5\cdot\left(-\dfrac{1}{4}\right)\cdot(-4)^n=\dfrac{5}{4}\cdot(-4)^n\\\\Answer:\boxed{a_n=-5\cdot(-4)^{n-1}\ other\ a_n=\frac{5}{4}\cdot(-4)^n}
6 0
3 years ago
Hi,please someone can help me i'm lost..
andreyandreev [35.5K]

Answer:

let the number be n

\frac{n}{6} +6=2\\\\\frac{n}{6} = -4\\\\n = -24

3 0
2 years ago
Help me please it’s due today
Zolol [24]

Answer:

49 ft  

Step-by-step explanation:

h(t) = 56t - 16t²

This is the equation of a parabola.

We must solve the equation to find the time (t) when the ball reaches its maximum height (h).  

The coefficient of t² is negative, so the parabola opens downward, and the vertex is a maximum.

One way to solve this problem is to convert the equation to the vertex form.

We do that by completing the square.

Calculation:

h = -16t² + 56t  

Divide both sides by -16 to make the coefficient of  t² equal to 1.

(-1/16)h = t² - ⁷/₂t

Square half the coefficient of t

(-7/4)² = 49/16

Add and subtract it on the right-hand side

(-1/16)h = t² - ⁷/₂t  + 49/16 - 49/16  

Write the first three terms as the square of a binomial

(-1/16)h = (t - ⁷/₄)² - 49/16

Multiply both sides by -16

h = -16(t - ⁷/₄)² + 49

You have converted your equation to  the vertex form of a parabola:

y = a(t - h)² + k = 0,

where (h, k) is the vertex.

h = ⁷/₄ and k = 49, so the vertex is at (⁷/₄, 49).

The time to reach maximum height is ⁷/₄ s = 1.75 s.

The graph below shows that the ball reaches a maximum height of 49 ft after 1.75 s.

5 0
2 years ago
A teenage boy is 6 ft tall and casts a shadow of 8ft.What is the distance from the top of his head to the end of his shadow?
lisabon 2012 [21]

Answer:

10 feet

Step-by-step explanation:

This image forms a special right triangle: 3-4-5. This represents the ratios of the sides.

Multiplying 3-4-5 by 2, you get 6-8-10. 10 is the hypotenuse (the answer you want) and the only number not listed in the problem.

4 0
2 years ago
Read 2 more answers
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Rus_ich [418]

Answer:

x = -25

x = infinite solutions

Step-by-step explanation for 1:

4(-25) - 10 = 5(-25) + 15

-100 - 10 = -125 + 15

-110 = -110

Step-by-step explanation for 2:

Both equations are the exact same. So whatever number you put, the answer will be right

8 0
2 years ago
Read 2 more answers
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