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3 years ago

Find the recursive formula for 18, 15, 12, 9, . .

Mathematics

1 answer:

Lady bird [3.3K]3 years ago

5 0

Answer: $a_{n}=a_{n-1}-3$ , $n\geq 2$

Step-by-step explanation:

$a_{1}$ = 18

The common difference = -3

Therefore :

$a_{n}=a_{n-1}-3$ , $n\geq 2$

check:

when n = 2

$a_{2}= a_{1}-3$

$a_{2}=18-3 = 15$

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3 years ago

Larinda cooked a 4-kilogram roast. The roast left over after the meal weighed 3 kilograms. How many grams of roast were eaten du

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Step-by-step explanation:

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3 years ago

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Can you work these out? 0.6x100 0.15x100 3.7x100 0.8x100 0.07x100

Monica [59]

Step-by-step explanation:

$0.6 \times 100 = 60 \\ 0.15 \times 100 = 15 \\ 3.7 \times 100 = 370 \\ 0.8 \times 100 = 80 \\ 0.07 \times 100 = 7$

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3 years ago

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kakasveta [241]

Answer:

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3 years ago

Find the total area the regular pyramid.

Ber [7]

Answer: $14\sqrt{3}$

Step-by-step explanation:

1. You must apply the following formula for calculate the total surface area the regular pyramid:

$SA=\frac{pl}{2}+B$

Where p is the perimeter of the base, l is the slant height and B is the area of the base.

2. The perimeter is, where s is the side length:

$p=3s=3*4=12$

3. The faces are isosceles traingles. So, to find the slant height you can divide one base into two equal right triangles and calculate the slant height with Pythagorean Theorem:

$l=\sqrt{4^2-2^2}=2\sqrt{3}$

4. The base is equal to any face, then both have equal areas. As previously you divide one base into two equal righ triangle to find the slant height, you can calcualte the area of one right triangle and multply it by 2 to calculate B:

$B=2*\frac{bh}{2}=2*\frac{2\sqrt{3}}{2}=2\sqrt{3}$

Finally substitute values:

$SA=\frac{12*2\sqrt{3}}{2}+2\sqrt{3}=14\sqrt{3}$

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3 years ago

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