In mathematical notation, ∑ means summation. So wherever you see the symbol, you have to sum over all elements in the set. Let's solve the question.
a. ∑m means, to sum all elements in the set m: ∑m = 12 + 15 + 20 + 30 = 77
b. ∑
means to sum all elements in the set f as the square of the elements f = 
c. ∑mf means to sum all elements as the product of the elements of m and f = (12×5) + (15×9) + (20
10) + (30×16) = 875
d. ∑
means to sum all elements as the product of the square of m and f = 
Answer:
about 2.4 or 2
Step-by-step explanation:
because 15 divided by 3 gives you unit rate which is 5 now 12 divided by 5 which you can round or get decimal
Answer:
The answer is 1.
Step-by-step explanation:
Nobel gases have full shell of valence electrons, that is why they tend to not enter any chemical reactions because they are satisfied while metals have very few electrons in the valence shell, so they are active in any chemical reaction.
Answer:
the answer is -4
Step-by-step explanation:
step 1: -7m<28
step 2: -7m÷ (-7)>28÷(-7)
step 3: m>28÷(-7)
step 4: m>-28÷7
step 5: m>-4
