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3 years ago

Help me plzzzzzzzzzzz

Mathematics

1 answer:

Inga [223]3 years ago

7 0

Answer:

A = 3

B = -5

C = 2

Step-by-step explanation:

The way to format a quadratic equation is: $ax^2 + bx + c$ , so the first step to solving this is to format it in the right way, where the $x^2$ comes first, the $x$ second, and the number alone.

After formatting, your equation should look like this: $3x^2 - 5x + 2$

From here, you can see the the a is 3, the b is -5, and the c is 2

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Please help. Don’t understand this math problem!!!

anzhelika [568]

Answer:

the line will have a point at -5, as that is it's y- intercept, and the slope is one so each following point is one diagonal to it on the right side, as the slope is positive

Step-by-step explanation:

3 0

3 years ago

1/4 cups is how much pints

oksano4ka [1.4K]

First we need the equivalence between cups and pints to solve this question, the equivalence is:
1 cup is 0.5 pint
So we can use a rule of three simple, direct proportion to solve the problem, we change the fraction 1/4 = 0.25 to ease calculations:
1 cup ----> 0.5 pint
0.25 cup ---> x

x = (0.25)(0.5)/1
x = 0.125

Therefore 1/4 cups is equivalent to 0.125 pints

5 0

3 years ago

(NEED DONE QUICK) Two angles are supplementary. One of the angles measures 4(2x+9) and the other angle measures 2(4x-8) what is

Studentka2010 [4]

Answer:

$x=10$

Step-by-step explanation:

Supplementary angles are angles equal to 180°.

Therefore:

$4(2x+9)+2(4x-8)=180$

Now that we have our equation, let's distribute the $4$ and the $2$ into the parentheses they are next to:

$8x+36+8x-16=180$

Combine like terms:

$16x+20=180$

Subtract $20$ from both sides of the equation:

$16x=160$

Divide by the coefficient of $x$ , which is $16$ :

$x=10$

Check your work by substituting $10$ into one of the equations above:

$8(10)+36+8(10)-16=180$

$80+36+80-16=180$

$180=180$

It's correct!

6 0

3 years ago

Prove by mathematical induction that

postnew [5]

For $n=1$ , on the left we have $\cos\theta$ , and on the right,

$\dfrac{\sin2\theta}{2\sin\theta}=\dfrac{2\sin\theta\cos\theta}{2\sin\theta}=\cos\theta$

(where we use the double angle identity: $\sin2\theta=2\sin\theta\cos\theta$ )

Suppose the relation holds for $n=k$ :

$\displaystyle\sum_{n=1}^k\cos(2n-1)\theta=\dfrac{\sin2k\theta}{2\sin\theta}$

Then for $n=k+1$ , the left side is

$\displaystyle\sum_{n=1}^{k+1}\cos(2n-1)\theta=\sum_{n=1}^k\cos(2n-1)\theta+\cos(2k+1)\theta=\dfrac{\sin2k\theta}{2\sin\theta}+\cos(2k+1)\theta$

So we want to show that

$\dfrac{\sin2k\theta}{2\sin\theta}+\cos(2k+1)\theta=\dfrac{\sin(2k+2)\theta}{2\sin\theta}$

On the left side, we can combine the fractions:

$\dfrac{\sin2k\theta+2\sin\theta\cos(2k+1)\theta}{2\sin\theta}$

Recall that

$\cos(x+y)=\cos x\cos y-\sin x\sin y$

so that we can write

$\dfrac{\sin2k\theta+2\sin\theta(\cos2k\theta\cos\theta-\sin2k\theta\sin\theta)}{2\sin\theta}$

$=\dfrac{\sin2k\theta+\sin2\theta\cos2k\theta-2\sin2k\theta\sin^2\theta}{2\sin\theta}$

$=\dfrac{\sin2k\theta(1-2\sin^2\theta)+\sin2\theta\cos2k\theta}{2\sin\theta}$

$=\dfrac{\sin2k\theta\cos2\theta+\sin2\theta\cos2k\theta}{2\sin\theta}$

(another double angle identity: $\cos2\theta=\cos^2\theta-\sin^2\theta=1-2\sin^2\theta$ )

Then recall that

$\sin(x+y)=\sin x\cos y+\sin y\cos x$

which lets us consolidate the numerator to get what we wanted:

$=\dfrac{\sin(2k+2)\theta}{2\sin\theta}$

and the identity is established.

8 0

3 years ago

What number is most likely going to be a number less than 7 when rolling a dice

stiv31 [10]

Answer:

Each is equally likely . The probability of rolling less than 7 is equal to the probability of rolling 1 or 2 or 3 or 4 or 5 or 6. That is 1/6 + 1/6 + 1/6 + 1/6 + 1/6 + 1/6 = 6/6.

3 0

3 years ago