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nataly862011 [7]

2 years ago

10

There are 20 questions on a taste. you gain 10 points for each correct answer and lose 5 points for each incorrect answer. A stu

dent answered all the questions and scored 125 points how many questions he got correct ?

1 answer:

BigorU [14]2 years ago

5 0

Answer:

20+10=30 30-5=25. 125-25=100

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Find the general solution of <img src="https://tex.z-dn.net/?f=2cos%282x%20%2B%20%5Cfrac%7B%5Cpi%20%7D%7B4%7D%20%29%20%3D%20%5Cs

Aleks04 [339]

Answer:

$\large\boxed{x=-\dfrac{\pi}{4}+k\pi\ \text{or}\ x=k\pi\ \text{for}\ k\in\mathbb{Z}}$

Step-by-step explanation:

$2\cos\left(2x+\dfrac{\pi}{4}\right)=\sqrt2\qquad\text{divide both sides by 2}\\\\\cos\left(2x+\dfrac{\pi}{4}\right)=\dfrac{\sqrt2}{2}\to2x+\dfrac{\pi}{4}=\pm\dfrac{\pi}{4}+2k\pi\\\\2x+\dfrac{\pi}{4}=-\dfrac{\pi}{4}+2k\pi\ \vee\ 2x+\dfrac{\pi}{4}=\dfrac{\pi}{4}+2k\pi\qquad\text{subtract}\ \dfrac{\pi}{4}\ \text{from all sides}\\\\2x=-\dfrac{2\pi}{4}+2k\pi\ \vee\ 2x=2k\pi\qquad\text{divide all sides by 2}\\\\x=-\dfrac{\pi}{4}+k\pi\ \vee\ x=k\pi\ \text{for}\ k\in\mathbb{Z}$

5 0

3 years ago

Write an equation of the line in point-slope form that passes through the given points. (-2,4) and (6,7)

Contact [7]

Answer:

y=3/8+19/4

Step-by-step explanation:

3 0

2 years ago

Round your answer to the nearest hundredth

nalin [4]

Answer:

A = arctan(BC/CA) = arctan(8/2) = 75.96 deg

Hope this helps!

:)

3 0

3 years ago

Help me I'm giving 20 points <br><br>a²•b⁶ if a =½ and b=2 ?

exis [7]

Answer:

try 0.5

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

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Gennadij [26K]

If x is 0 then I think it would be the 3 to the second power and that is 9. Because 0 + 9 = 9. Correct me if I’m wrong!

8 0

2 years ago