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maria [59]
3 years ago
10

taniqua took a test that had 20 multiple choice questions and 10 true/ false question. she got 9/10 of the multiple choice corre

sct and she got 4/5 of the true/false correct. how many multiple choice questions she got correct? and how many true/false
Mathematics
2 answers:
viktelen [127]3 years ago
5 0
She got 18 multiple choice questions correct and 8 of the true/false questions correct.
hope it helps
love history [14]3 years ago
4 0
Taniqua got 18 multiple choice answers right and she got 8 of the true/ false :))) i hope i helped if i did can i be brainliest ? :)
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What are the zeros of the function f(x)=x^2-2x-15?
valkas [14]
To find the zeros of this function, we must first set the entire function equal to 0

f(x) = x² - 2x - 15 = 0

Since this is a quadratic function, we must use the quadratic formula, which is:

\frac{-b +/-  \sqrt{b^{2} - 4(a)(c) } }{2a}

Let's assign a, b, and c using our first function
x² means a = 1 (because it could be written as 1x²)
-2x means b = -2
-15 means c = -15

Now let's plug those in:

\frac{-(-2) +/- \sqrt{(-2)^{2} - 4(1)(-15) } }{2(1)}

which simplifies to:

\frac{2 +/- \sqrt{(4 + 60} }{2}

Simplified further:

\frac{2 +/- \sqrt{(64} }{2}
\frac{2 +/- 8 }{2}
And divide it by the 2 on the bottom gives us:

2 +/- 4

2+4 = 6
2-4 = -2

So the zeros of this function are -2 and 6
6 0
3 years ago
Read 2 more answers
How do you solve 1/2x x 3/5y=5
Anit [1.1K]
1/2 is a fraction so it is 5
8 0
2 years ago
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Show that cos(3x) = cos3(x) − 3 sin2(x)cos(x). (Hint: Use cos(2x) = cos2(x) − sin2(x) and the cosine sum
otez555 [7]

<u>Step-by-step explanation:</u>

To prove:

\cos 3x=\cos^3x-3\sin^2 x\cos x

Identities used:

\cos(A+B)=\cos A\cos B+\sin A\sin B      ......(1)

\sin 2A=2\sin A\cos A        ........(2)

\cos 2A=\cos^2A-\sin^2 A     .......(3)

Taking the LHS:

\Rightarrow \cos 3x=\cos (x+2x)

Using identity 1:

\Rightarrow \cos (x+2x)=\cos x\cos 2x-\sin x\sin 2x

Using identities 2 and 3:

\Rightarrow \cos x(\cos ^2x-\sin^2 x)-\sin x(2\sin x\cos x)\\\\\Rightarrow \cos^3x-\sin^2x\cos x-2\sin^2 x\cos x\\\\\Rightarrow \cos^3x-3\sin^2x\cos x

As, LHS = RHS

Hence proved

4 0
2 years ago
Find the partial fraction of the following ???<br>x/(1-x)³​
Alja [10]

\frac{x}{ {1}^{3} - 3x +  {3x} -  {x}^{3}   }

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3 years ago
I need help !!30 PTS!!<br>Pls DO help on ALL 3 on the screenshot
GenaCL600 [577]

1. (16,25)-(24,5) the interval it falls from is 25 mph to 5 mph or it decreased by 20 mph.

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