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GuDViN [60]
3 years ago
13

The area of a circle is given by πr2, where r is the radius of the circle. If we use rounding to the nearest whole number, what

is a reasonable estimate of the area of a circle with a radius of 4.89 cm?

Mathematics
1 answer:
Makovka662 [10]3 years ago
4 0

Answer:

75cm^2

Step-by-step explanation:

Check attachment

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Find the length of diagonal HJ. Round to the nearest hundredth.
Alisiya [41]

Answer:

The length of the diagonal HJ is 10.82 units

Step-by-step explanation:

* Lets revise the rule of the distance between two points

- d=\sqrt{(x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2}}, where

 (x_{1},y_{1}) and (x_{2},y_{2}) are the two points

* Lets use this rule to find the length of the diagonal HJ

∵ The coordinates of point H are (-4 , 3)

∵ The coordinates of point J are (5 , -3)

∴ x_{1}=-4 and x_{2}=5

∴ y_{1}=3 and y_{2}=-3

- Lets find the length of the diagonal HJ by using the rule above

∴ HJ = \sqrt{(5-(-4))^{2}+(-3-3)^{2}}=\sqrt{(5+4)^{2}+(-6)^{2}}

∴ HJ = \sqrt{(9)^{2}+36}=\sqrt{81+36}=\sqrt{117}=10.81665

∴ HJ = 10.82

* The length of the diagonal HJ is 10.82 units

7 0
3 years ago
2z-18-4z=-8 what is the value of z
zmey [24]

The z is 5

−2⋅<em>z</em>=−8+18

-

2

⋅

z

=

-

8

+

18

Simplify :

−2⋅<em>z</em>=10

-

2

⋅

z

=

10

Dividing by the variable coefficient :

<em>z</em>=−

10

2

z

=

-

10

2

Simplify :

<em>z</em>=−5

z

=

-

5

The solution of equation

2⋅<em>z</em>−18−4⋅<em>z</em>=−8

2

⋅

z

-

18

-

4

⋅

z

=

-

8

is

[−5]

7 0
3 years ago
Mrs. Saddler and her family go out for dinner. Their bill was $55.25. Mrs. Saddler leaves a 18% tip. What is Mrs. Saddler’s tota
olchik [2.2K]
You multiply 55.25 by 0.18. You get 9.945 and then you add it to 55.25. You should get 65.195. Round it to $65.20. That's your answer.
5 0
3 years ago
Find an equation for the line perpendicular to y=-1/2x+4 and goes through the point (-1,10)
Artemon [7]

The slope of the perpendicular line will be 2. Remember, a perpendicular slope is the negative reciprocal.

So, we can make the equation y=2x+b. We need to find b, and put b in.

To find b, put in the numbers of y and x.

10=2(-1)+b

Solve for b:

10=-2+b\\b=10+2\\b=12

Now replace b in the original equation with 12 and that will be the answer:

The answer is y=2x+12.

5 0
3 years ago
Does anyone know what the answer is
Natali5045456 [20]

Answer:

cheating in entrance

Step-by-step explanation:

circumference: 14π

area: 49π

8 0
3 years ago
Read 2 more answers
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