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3 years ago

What is 80 percent of 25

Mathematics

2 answers:

11Alexandr11 [23.1K]3 years ago

8 0

It's 20. Multiply 80%, which is also equal to 0.8 by 25. That's how you get the answer. 0.8*25=20.

vitfil [10]3 years ago

3 0

20 is 80% of 25, 20 is the answer

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3 0

3 years ago

Read 2 more answers

Sabendo que "K" satisfaz a equação {2(k-8) + 3(-k+1) = -4k +11} Os valores reais de x que satisfazem a equação 15x² - kx + 1 = 0

erastova [34]

Answer:

D) 1/5 e 1/3

Step-by-step explanation:

You have the following quadratic equation:

$15x^2-kx+1=0$ (1)

In order to find the values of x that are solution to the equation (1), you first find the solution for k in the following equation:

$2(k-8)+3(-k+1)=-4k+11\\\\2k-16-3k+3=-4k+11\\\\2k-3k+4k=11+16-3\\\\3k=24\\\\k=8$

Next, you replace the previous value of k in the equation (1) and you use the quadratic formula to find the roots:

$15x^2-8x+1=0\\\\x_{1,2}=\frac{-(-8)\pm \sqrt{(-8)^2-4(15)(1)}}{2(15)}\\\\x_{1,2}=\frac{8\pm 2}{30}\\\\x_1=\frac{1}{5}\\\\x_2=\frac{1}{3}$

Then, the roots of the equation (1) are

D) 1/5 e 1/3

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3 years ago

1,002 divided by 0.499

Zina [86]

Yuh can juss calendar it

7 0

3 years ago