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2 years ago

Find the value of x

Mathematics

1 answer:

ivanzaharov [21]2 years ago

3 0

Answer:

value of x would be 7

fow more explanation you can comment down

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Evaluate the expression when x= -7. x²+4x-3

I am Lyosha [343]

The answer is 18
-7^2+4(-7)-3
49+(-28)-3
21-3
18

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2 years ago

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Name all the awnsers below

spayn [35]

Answer:

this doesn't look fun.

Step-by-step explanation:

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2 years ago

A shade of yellow light with a wavelength of 5.8×10-7 m and a frequency of 5.17 × 10-14 Hz

harina [27]

Step-by-step explanation:

We have,

The wavelength of yellow light, $\lambda=5.8\times 10^{-7}\ m$

Frequency of yellow light, $f=5.17\times 10^{-14}\ Hz$

It is assumed to find the speed of light in the yellow light.

The speed of a wave is given in terms of wavelength and frequency as :

$v=f\lambda\\\\v=5.17\times 10^{-14}\times 5.8\times 10^{-7}\\\\v=2.99\times 10^{-20}\ m/s$

So, the speed of light in a shade of yellow light is $2.99\times 10^{-20}\ m/s$ .

4 0

2 years ago

Hey, I need help! 2+2+=?

Basile [38]

Answer:

Step-by-step explanation:

5 0

2 years ago

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Here's the question

zheka24 [161]

Answer:

Step-by-step explanation:

perimeter (p) = 8 + 17 + 15 = 40

semi-perimeter (s) = p/2 = 20

Area = square root of s(s-a)(s-b)(s-c) where a,b,c are the sides of the triange by Herons formula.

Therefore, area = 20(20-8)(20-15)(20-17) = square root of 3600 = 60

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2 years ago