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3 years ago

Rút gọn biểu thức chứa căn

Mathematics

1 answer:

olya-2409 [2.1K]3 years ago

3 0

Answer:

CHENG CHANG ching ching

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irina1246 [14]

Answer:

18.1

Step-by-step explanation:

You can use the c = b/cos(a) which when subsituted gives u c= 16/cos(28) which when u solve gives u 18.12112

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3 years ago

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If x=-7 is a root of the equation x^2+kx+49=0, then k=

aleksley [76]

Answer:

$k=14$

Step-by-step explanation:

Given:

$x^{2}+kx+49 = 0$

$x = -7$

Substitution can be used to find the value of $k$ :

$(-7)^{2}+(-7)k+49 = 0$

$49-7k+49 = 0$

$98 -7k = 0$

$k = 14$

Hope this helps :)

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3 years ago

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8090 [49]

Answer:

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Step-by-step explanation:

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3 years ago

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adoni [48]

i think it might be 256

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4 years ago

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Sue used the equation y=10x to calculate how much money, y, she would make for babysitting x hours. How many hours did Sue babys

kkurt [141]

Y = 10x

Plug in $260 for y.

260 = 10x
Divide by 10.

x = 26

Sue babysat for 26 hours.

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4 years ago