2 years ago

What is the 20th term of the sequence 2n-5? I need help.

Mathematics

2 answers:

Dafna11 [192]2 years ago

6 0

Answer: 35

Step-by-step explanation: substitute 20 into n,

2(20)-5

40-5

Mandarinka [93]2 years ago

4 0

Answer should be 35 for you

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Step-by-step explanation:

there is a total of 3 guitar picks

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3 years ago

What is the surface area of a rectangular prism that is 12cm by 3cm by 5cm?

Cerrena [4.2K]

A = 2lw + 2lh + 2hw
A = 2(12)(3) + 2(12)(5) + 2(5)(3)
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Hope this helps!! :)

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2 years ago

One bag of mulch covers a 1 3/4 yard section of Hailey's garden. If her garden is 10 3/5 yards in size, how many bags of mulch d

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2 years ago

What is the area of a triangle with vertices (3,0) (9,0) (7,6)

Nezavi [6.7K]

Answer:

The area of the triangle is of 21 units of area.

Step-by-step explanation:

The area of a triangle with three vertices $(x_1,y_1),(x_2,y_2),(x_3,y_3)$ is given by the determinant of the following matrix:

$A = \pm 0.5 \left|\begin{array}{ccc}x_1&y_1&1\\x_2&y_2&1\\1_3&y_3&1\end{array}\right|$

In this question:

Vertices (3,0) (9,0) (7,6). So

$A = \pm 0.5 \left|\begin{array}{ccc}3&0&1\\9&0&1\\7&7&1\end{array}\right|$

$A = \pm 0.5(3*0*1+0*1*7+1*9*7-0*7*1-0*9*1-3*1*7)$

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2 years ago

I am giving away my points bc I don't like this website

LiRa [457]

Thanks !!!!!!!!!!!!!

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3 years ago