Solve using the quadratic formula for <br> -7d^2+2d+9=0

Tính diện tích S của hình phẳng giới hạn bởi các đường y=x³,y=2-x² và x=-1

tiny-mole [99]

Answer: uhhh

Step-by-step explanation:

4 0

3 years ago

A system of equations is graphed on a coordinate plane.

mars1129 [50]

The solution can be found where two lines intersect. The lines in the image do not intersect at an exact point, so we will need to estimate.
The x value is either 1 or -1 from your choices. You can see it is closer to -1 on the horizontal (x axis).
The y value is either 0 or -1 from your choices. You can see it is closer to 0 on the vertical (y axis).
The answer to your set of lines is approximately (-1,0).

5 0

4 years ago

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A bird flies a velocity of 8 m/s ñ. How long does it take the bird to travel a horizontal distance of 400 meters?

sergejj [24]

Answer:

50 seconds

Step-by-step explanation:

Well, if the bird is travelling 8 m/s then you divide 400 by 8 to figure out how long it would take it to fly, since 8 x 50= 400.

6 0

4 years ago

Write (3i - 2/3) - (6i-5) as a complex number in standard form. I have no idea what im doing to be honest -_-. Give me pointers

allochka39001 [22]

$\bf \left( 3i-\cfrac{2}{3} \right)-(6i-5)\implies 3i-\cfrac{2}{3}-6i+5
\\\\\\
-6i+5-\cfrac{2}{3}\implies 
\begin{array}{llll}
\cfrac{13}{3}&-&6i\\
\uparrow &&\uparrow \\
a&-&bi
\end{array}$

standard form for a complex expression, I assume it means the a + bi form, nothing else

5 0

3 years ago

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An inspector inspects large truckloads of potatoes to determine the proportion p in the shipment with major defects prior to usi

anastassius [24]

Answer:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)