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azamat
3 years ago
9

If Hector is 8 years old and Mary is 3 years old, how old will Mary be when Hector is 16? Can I use proportional reasoning in he

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

Answer:

Step-by-step explanation:

H=8

M=3

=>difference is 5 years

H=16

=>M=16+5=21

will be nice if you give me brainlies.Good luck!

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Find the value of z in the figure below.<br>.​
zzz [600]

answer

z = 100

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when inscribed in a circle, the opposite angles of a quadrilateral add up to 180

so z + 80 = 180 and y + 120 = 180

solve for z

z + 80 = 180

z = 180 - 80

z = 100

3 0
3 years ago
Pls answer I give brainliest
RideAnS [48]

Answer:

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Step-by-step explanation:

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3 years ago
an isosceles triangle has congruent sides of 20cm. the base is 10cm. find the height of the triangle.​
dolphi86 [110]

Answer:

\large\boxed{A_\triangle=25\sqrt{15}\ cm^2}

Step-by-step explanation:

Look at the picture.

The formula of an area of a triangle:

A_\triangle=\dfrac{bh}{2}

<em>b</em><em> - base</em>

<em>h</em><em> - height</em>

<em />

We need a length of a height.

Use the Pythagorean theorem:

leg^2+leg^2=hypotenuse^2

We have:

leg=5,\ leg=h,\ hypotenuse=20

Substitute:

5^2+h^2=20^2

25+h^2=400             <em>subtract 25 from both sides</em>

h^2=375\to h=\sqrt{375}\\\\h=\sqrt{(25)(15)}\\\\h=\sqrt{25}\cdot\sqrt{15}\\\\h=5\sqrt{15}\ cm

Calculate the area:

A_\triangle=\dfrac{(10)(5\sqrt{15})}{2}=\dfrac{50\sqrt{15}}{2}=25\sqrt{15}\ cm^2

8 0
3 years ago
The sum of two numbers is 300 and the two numbers have a ratio of 20:10.find the larger number
Stolb23 [73]
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4 years ago
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