3 years ago

An atom has 10 protons, 9 neutrons, and 11 electrons.

Mathematics

1 answer:

Eddi Din [679]3 years ago

4 0

Answer:

That would be Neon.

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−2.8+2.4+7.8−2.8 I dont know how to solve this expression

Nataliya [291]

Step-by-step explanation:

-2.8 +2.4=-.4

-.4+7.8=7.4

7.8-2.8=5

i hope this helps ; )

6 0

3 years ago

The base of a triangle is 9/4 times of its height. If the area of triangle is 144 cm2. Find the height and the base.

Mazyrski [523]

Step-by-step explanation:

Given that the base of triangle is 9/4 times of its height . And area is 144 cm² . Let the height be h , then its base be 9h/4 .

• According to Question :-

$\tt\to Area_{(\triangle)}=\dfrac{base\times height}{2}\\\\\tt\to 144cm^2 = \dfrac{9h\times h}{4\times 2 } \\\\\tt\to h^2 =\dfrac{12\times 12 \times 2 \times 2 }{3\times 3 }\\\\\tt\to h =\sqrt{\dfrac{12\times 12 \times 2 \times 2 }{3\times 3 }}\\\\\tt\to h =\dfrac{(12)(2)}{3} \\\\\tt\to \boxed{\orange{\tt h = 8 cm }}$