Answer:
96
lower right
Step-by-step explanation:
Part 1
Givens
a1 = - 20
d = +4
n = 30
Equation
a30 = a1 + (n - 1)d
Solution
a30 = -20 + (30 - 1)*4
a30 = -20 + 29*4
a30 = - 20 + 116
a30 = 96
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Part 2
Formula
Sum = (a1 + L)*n/2
n = 30
So only the two on the right can be considered
a1 = -20
L = 96
Sum = (-20 + 96)30/2 is the bottom right. D if you think of it that way.
Mass number = atomic number + number of neutrons
23 = 11 + n
n = 23 - 11 = 12
Therefore, thre are 12 neutron in the neucleus of a Sodium atom.
1) Rational numbers = 1/2, √25
2) Integers = -10,
3) whole numbers = -10
1) Rational number = 0.5,
2) Integers = 3, -2
3) Whole numbers = 3, -2
Hope this helps!
The square root of 140 is 11.83, so no 10.7 is not approximate.
