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Diano4ka-milaya [45]
2 years ago
10

I need help please!:D

Mathematics
1 answer:
givi [52]2 years ago
5 0

Answer:

a 80

Step-by-step explanation:

7200 / 90 = 80

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Is this the correct graphing for the inequality 2c&lt;=100?<br> i’ll mark brainliest please help!!!
zepelin [54]

Answer:

Step-by-step explanation:

2c≤100 |:2

c≤50

So the correct graphing would be (-∞;50]

5 0
2 years ago
PLEASE HELP ASAP
Crank

Option D: $f(x)=-2(x+2)(x-4)$ is the function

Explanation:

Let the general form of quadratic equation be $y=a x^{2}+b x+c$

The function passes through the intercepts (-2,0) and $(4,0)$ and also passes though the point $(-1,10)$

Substituting the points (-2,0), $(4,0)$ and $(-1,10)$ in the equation $y=a x^{2}+b x+c$, we get,

4a -2b+c=0  -----------(1)

16a +4b+c=0 ----------(2)

a-b+c=10    -----------(3)

Subtracting (1) and (2), we get,

\ \ 4a -2b+c=0\\ 16a +4b+c=0\\\---------\\ \  \ -12a-6b=0  -----------(4)

Subtracting (2) and (3), we get,

16a +4b+c=0\\\ \ a \ \ - \ \ b \ +c=10\\---------\\15a+5b=-10  ------------(5)

Multiplying equation (4) by 5 and equation (5) by 4, to cancel the term b when adding, we get,

-60a-30b=0\\\ 90a+30b=-60\\--------\\30a=-60\\\ \ a=-2

Thus, the value of a is a=-2

Substituting a=-2 in equation (4), we get,

$\begin{aligned}-12 a+6 b &=0 \\-12(-2)-6 b &=0 \\ 24-6 b &=0 \\ 24 &=6 b \\ 4 &=b \end{aligned}$

Thus, the value of b is b=4

Now, substituting the value of a and b in equation (1), we have,

$\begin{aligned} 4 a-2 b+c &=0 \\ 4(-2)-2(4)+c &=0 \\-8-8+c &=0 \\ c &=16 \end{aligned}$

Thus, the value of c is c=16

Now, substituting the value of a,b and c in the general formula $y=a x^{2}+b x+c$, we get,

y=-2x^{2} +4x+16

Taking out the common term as -2 we get,

y=-2(x^{2} -2x-8)

Factoring , we get,

$y=-2(x+2)(x-4)$

Thus, the function is $f(x)=-2(x+2)(x-4)$

7 0
3 years ago
Which expression is equivalent to 1/4x + 3 - 1/3x + (-2), A.) x+5, B.) 1/12x - 1, c.) x+1, d)1-1/12x
kati45 [8]

The answer is d)1-1/12x

3 0
3 years ago
Which rational number is one tick mark to the left of -3/4
Zolol [24]

I'm assuming each tickmark is 1/4 = 0.25

If that assumption is correct, then going one tickmark to the left of -3/4 lands you on -4/4 which simplifies to -1.

So -1 is one tickmark to the left of -3/4

Again, this all hinges on the assumption that each tickmark is 1/4 a unit away from its neighbor.

5 0
3 years ago
Tyrone invested money for 3 years at 5% interest. If the interest paid was $60, how much money was invested? What was the total
yan [13]

Answer:

He invested $1200 and had a balance of $1260 after 3 years.

3 0
3 years ago
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