The diagram below represents the nucleus of an atom. What are the atomic number and mass number of this atom?

The atomic number is 11 and the mass number is 20.
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The atomic number is 11 and the mass number is 19.
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The atomic number is 9 and the mass number is 20.
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The atomic number is 9 and the mass number is 19.
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In angle pqr find the measure of

Consider the first four terms of the sequence below. what is the 8th term of this sequence?

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?