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3 years ago

I need someone to please explain to me how my homework is done cause I’m lost and it’s due in a bit so

Mathematics

2 answers:

slavikrds [6]3 years ago

4 0

Answer:

7 : 3

Step-by-step explanation:

Julli [10]3 years ago

3 0

Answer:

7:3

Step-by-step explanation:

In the big square, there are 100 tiny squares.

There are 70 shaded squares.

There are 30 unshaded squares.

The ratio is 70:30

Simplify by dividing by 10 on both sides.

7:3

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Bill bought cards to celebrate Pi day. He sends 60% of his cards to friends. He sent 42 cards to friends. How many cards did he

Sergeeva-Olga [200]

60%=0.6
0.6x=42
x=42/0.6=70

70 cards

8 0

3 years ago

Dentify on which quadratic function is positive.

Olin [163]

Answer:

$\textsf{$y = 2x^2 - 17x + 30$: \quad $\left(-\infty, \dfrac{5}{2}\right) \cup (6, \infty)$}$

$\textsf{$y = - x^2 - 6x - 8$: \quad $\left(-\infty, -4\right) \cup (-2, \infty)$}$

Step-by-step explanation:

A function is positive when it is above the x-axis, and negative when it is below the x-axis.

---------------------------------------------------------------------------------

Given quadratic equation:

$y = 2x^2 - 17x + 30$

Factor the equation:

$\implies y = 2x^2 - 17x + 30$

$\implies y = 2x^2 - 5x-12x + 30$

$\implies y=x(2x-5)-6(2x-5)$

$\implies y=(x-6)(2x-5)$

The x-intercepts of the parabola are when y = 0.

To find the x-intercepts, set each factor equal to zero and solve for x:

$\implies x-6=0 \implies x=6$

$\implies 2x-5=0 \implies x=\dfrac{5}{2}$

Therefore, the x-intercepts are x = ⁵/₂ and x = 6.

The leading coefficient of the given function is positive, so the parabola opens upwards.

The function is positive when it is above the x-axis.

Therefore, the function is positive for the values of x less than the smallest x-intercept and more than the largest x-intercept:

$\textsf{Solution: \quad $x < \dfrac{5}{2}$ \;and \;$x > 6$}$

$\textsf{Interval notation: \quad $\left(-\infty, \dfrac{5}{2}\right) \cup (6, \infty)$}$

---------------------------------------------------------------------------------

Given quadratic equation:

$y = - x^2 - 6x - 8$

Factor the equation:

$\implies y = - x^2 - 6x - 8$

$\implies y = -(x^2 +6x +8)$

$\implies y = -(x^2 +4x +2x+8)$

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

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

The x-intercepts of the parabola are when y = 0.

To find the x-intercepts, set each factor equal to zero and solve for x:

$\implies x+4=0 \implies x=-4$

$\implies x+2=0 \implies x=-2$

Therefore, the x-intercepts are x = -4 and x = -2.

The leading coefficient of the given function is negative, so the parabola opens downwards.

The function is negative when it is below the x-axis.

Therefore, the function is negative for the values of x less than the smallest x-intercept and more than the largest x-intercept:

$\textsf{Solution: \quad $x < -4$ \;and \;$x > -2$}$

$\textsf{Interval notation: \quad $\left(-\infty, -4\right) \cup (-2, \infty)$}$

4 0

10 months ago

Read 2 more answers

Which equivalent expression to 2w + 1/2 ( -40 + 12 ) ?

Tju [1.3M]

Answer:

Step-by-step explanation:

That is the answer

Hope that helps

5 0

2 years ago

Why do ratios work in math

vladimir2022 [97]

A ratios says how much of one thing there is compared to another thing and the trick with ratios is to always multiply or divide the numbers by the same value

6 0

3 years ago

It cost Brody $9.80 to send 196 text messages. How many text messages did he send if he spent $4.20?

Lelechka [254]

Answer:

Answer is A

Step-by-step explanation:

I don't really know if am right but can u give a like to this answer that will really make me happy :)

3 0

3 years ago

Read 2 more answers