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2 years ago

I need help on number 7 I don’t understand it

Mathematics

1 answer:

Karo-lina-s [1.5K]2 years ago

5 0

Answer:

a) Right triangle b) Obtuse triangle c) equilateral triangle.

Step-by-step explanation:

A right triangle has a 90 degree angle. Obtuse triangles need to have one angle greater than 90 degrees, and equilateral triangles have same sides.

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Find the value of expression - 17x-19xpwer4 - 21x power 2,when x=3

Marrrta [24]

Answer:

$-17x - 19x^4 - 21x^2 = -1779$ when $x = 3$

Step-by-step explanation:

Given

$-17x - 19x^4 - 21x^2$

$x = 3$

Required

Solve

Substitute 3 for x in $-17x - 19x^4 - 21x^2$

$-17x - 19x^4 - 21x^2 = -17*3 - 19*3^4 - 21*3^2$

Evaluate all exponents

$-17x - 19x^4 - 21x^2 = -17*3 - 19*81 - 21*9$

$-17x - 19x^4 - 21x^2 = -51 - 1539- 189$

$-17x - 19x^4 - 21x^2 = -1779$

7 0

3 years ago

What does : mean in a mathematical sentence

yan [13]

I think division, at least that's how I wrote it in school

6 0

2 years ago

An object is launched vertically in the air at 36.75 meters per second from a 6-meter-tall platform. Using the projectile motion

nasty-shy [4]

I HAVE THE SAME QUESTION

5 0

3 years ago

What side is the shortest in the picture? A. GF B. DG C. EF D. GE F. DE

igor_vitrenko [27]

Answer:

A. GF

Step-by-step explanation:

The shortest side in a triangle is opposite the smallest angle

<d = 180 -52 -61 =67

The smallest angle is 52 so the smallest side is DG

<f = 180 - 48-85 =50

The smallest angle is 48 so the smallest side is FG

The smallest angle is 48 so the smallest side overall is FG (GF)

4 0

2 years ago

Nth term of this sequence please 18, 16, 14, 12

Annette [7]

Answer:

$\boxed{\sf -2n+20}$

Step-by-step explanation:

Let’s find the common difference.

The common difference can be found by subtracting a term in the sequence with the previous term.

$\sf d=16-18\\d=-2$

Apply formula for the $\sf n^{th}$ term of an arithmetic sequence.

$\sf a_n=a_1+dn-d$

$\sf a_1$ is the first term of the sequence.

$\sf d$ is the common difference.

$\sf a_n=18+-2n-(-2)$

$\sf a_n=18+-2n+2$

$\sf a_n=-2n+20$

8 0

3 years ago