Pape 19. 1+2+3+4+5+ ... + 1 = n(n+1)
n
2
(a) i) Show that this formula is true for the sum of the first 8 natural numbers.
ii) Find the sum of the first 400 natural numbers.

Aphrase is shown read the phrase and give me the answer

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.

Question 3(multiple choice worth 1 points) use the arc length formula and the given information to find r. s = 16 cm, θ = 48°; r = ? sixty divided by pi cm thirty divided by pi cm one third cm one hundred twenty divided by pi cm