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3 years ago

Why is it not possible to form a right triangle with the lengths 2, 4 and 7?

Mathematics

2 answers:

Anna [14]3 years ago

7 0

Step-by-step explanation:

answer is

B. because 2 + 4 = 7

please mark as brilliant

Korolek [52]3 years ago

5 0

Answer:

Pythagorean Theorem

a^2 + b^2 = c^2

2^2 + 4^2 = 7^2?

This is not true, so the answer is C. Because 2² + 4² ≠ 7².

Let me know if this helps!

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Answer:

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4 years ago

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3 years ago

The 3rd term of a geometric sequence is -1/3 and the 8th term is 81. what is the 11th term?

shepuryov [24]

Answer: $t_{11}=-2187$

Step-by-step explanation:

$t_{3}=-1/3$

That is :

$ar^{2} = -1/3$ ................. equation 1

Also

$t_{8}=81$

that is

$ar^{7}=81$ ................. equation 2

divide equation 2 by equation 1 , that is

$\frac{ar^{7}}{ar^{2}} = 81 / -1/3$

$r^{5}=$ $81$ x $-3/1$

$r^{5}= -243$

find the fifth root of both sides

$r = -3$

substitute $r = -3$ , into equation 1 to find a , that is

$a(-3^{2})= -1/3$

$9a = -1/3$

multiply through by 3

$27a = -1$

$a =- 1/27$

To find the 11th term , the formula for the 11th term is given as :

$t_{11}=ar^{10}$

$t_{11}= -1/27(-3^{10})$

$t_{11}=-2187$

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4 years ago

F(x) = 2x2 – 15<br> Find f(-2)

Helen [10]

F(x) = 2x^2 -x -15 = 0

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4 years ago