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Nata [24]
3 years ago
6

HELP ME PLZZZ ASAP!

Mathematics
1 answer:
Alex3 years ago
4 0

Answer: I don't think he made an error.

Step-by-step explanation: This is because he got the right answer

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Write the equation for a line that goes through the points (0,7) and (9, 2)
mart [117]

Answer:

the answer is y=-0.556·x+7

6 0
3 years ago
Area of a circle is 80 cm². Work out the circumference of the circle.
GuDViN [60]

Answer:

The circumference of circle is: 31.714 cm

Step-by-step explanation:

Let C be the circumference of the circle

And A be the area of circle

It is given that:

A = 80cm^2

We have to find the radius first so that it can be used to find the circumference

The area of circle is given by the formula:

A = \pi r^2

Putting the value of area

80 = 3.14 * r^2\\\frac{80}{3.14} = r^2\\r^2 = 25.477

Taking square root on both sides

\sqrt{r^2} = \sqrt{25.477..}\\r = 5.0475\ cm

Now

C = 2\pi r

Putting the value of radius

C = 2 * 3.14 * 5.05\\C = 31.714\ cm

Hence,

The circumference of circle is: 31.714 cm

3 0
3 years ago
Explain in detail how to find the vertex: <br> y=-2x^2 + 2x + 3
Cerrena [4.2K]

\bf \textit{vertex of a vertical parabola, using coefficients} \\\\ y=\stackrel{\stackrel{a}{\downarrow }}{-2}x^2\stackrel{\stackrel{b}{\downarrow }}{+2}x\stackrel{\stackrel{c}{\downarrow }}{+3} \qquad \qquad  \left(-\cfrac{ b}{2 a}~~~~ ,~~~~  c-\cfrac{ b^2}{4 a}\right)


\bf \left(-\cfrac{2}{2(-2)}~~,~~3-\cfrac{2^2}{4(-2)}  \right)\implies \left( \cfrac{1}{2}~~,~~3+\cfrac{4}{8} \right)\implies \left(\cfrac{1}{2}~~,~~\cfrac{28}{8}  \right) \\\\\\ \left(\cfrac{1}{2}~~,~~\cfrac{7}{2}  \right)\implies \left(\frac{1}{2}~,~3\frac{1}{2}  \right)

7 0
3 years ago
Find the area of the figure. Use 3.14 for π.<br><br> The area of the figure is __ft2.
Mariulka [41]

Answer:

42,5ft2

Step-by-step explanation:

mutiply 3 x 3=9 than divide by 2 that is equals

4,5, mutiply 4 x 3 that is equals to 12 and divide by 2 that is equals to 6, then you dont need to divide thst one because its not a triangle, mutiply 4 x 8 = 32 32 + 4,5 + 6 = 42,5.

6 0
2 years ago
Can someone help me with these 2 problems thank you
hjlf

Answer:

For question 6 there are 3 steps, and for question 7 there are 2 steps

Step-by-step explanation:

Question 6:

step 1. 89 x 2=178

step 2. 89 x 3=267

step 3. 267 + 178=445

Question 7:

step 1. 35 x 3= 105

step 2. 25 x 5= 12

Your're welcome :)

6 0
3 years ago
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