4 years ago

Please help me :(

Mathematics

1 answer:

Annette [7]4 years ago

3 0

C can be -8 or 16 and the value of m is 2

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Factor 12t2 + 70t + 72 completely

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4 years ago

Solve the system of equations using the substitution method. -5x + 21 = 18 y= 2x+8

Vlad1618 [11]

Answer:

(-3;2)

Step-by-step explanation:

if the first equation is -5x+21=18y, then:

$\left \{ {{y=2x+8} \atop {-5x+21=18*(2x+8)}} \right. \ => \ \left \{ {{y=2x+8} \atop {-5x+21=36x+144}} \right. \ => \ \left \{ {{y=2x+8} \atop {41x=-123}} \right. \ => \ \left \{ {{y=2} \atop {x=-3}} \right.$

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4 years ago

Read 2 more answers

if the xy-plane, the graph of y=x^2 and the circle with center (0,1) and radious 3 have how many points of intersection?

Rashid [163]

$\bf \textit{equation of a circle}\\\\
(x-{{ h}})^2+(y-{{ k}})^2={{ r}}^2
\qquad 
\begin{cases}
center\ ({{ h}},{{ k}})\\
radius={{ r}}\\
----------\\
center\ (0,1)\to 
\begin{cases}
h=0\\
k=1
\end{cases}\\
r=3
\end{cases} 
\\\\\\
(x-0)^2+(y-1)^2=3^2\implies x^2+(y-1)^2=9
\\\\\\
(y-1)^2=9-x^2\implies y=\sqrt{9-x^2}+1\\\\
-----------------------------\\\\
\textit{where do the parabola and circle intersect? set them to equal}
\\\\\\

$

$\bf \begin{cases}
y=x^2\\\\
y=\sqrt{9-x^2}+1
\end{cases}\qquad y=y\implies x^2=\sqrt{9-x^2}+1$

solve for "x"

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4 years ago

Which is the mode of this data set? 55, 78, 43, 39, 78, 61, 75, 50, 43, 78

ruslelena [56]

The mode of the data set is 78 because 78 shows up 3 times

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3 years ago