Answer:
See below in bold.
Step-by-step explanation:
The formula is Tn = n(n + 1) / 2
The first triangular number is 1(1+1) / 2 = 2/2 = 1.
So the 15th = 15(15+1) / 2 = 120.
and the 19th = (19 * 20) / 2 = 190.
Answer:
18cm
Step-by-step explanation:
20/10 = 2cm
So since 2x10 is 20 and it exceeded only 10%, we only subtract 2 from 20 which you leave you with 18cm.
Answer:
y=40
Step-by-step explanation:
A direct variation is a relationship between two numbers where the output equals the input times a constant.
The equation for a direct variation can be written as
y=kx
We can figure out the y value of the second coordinate by finding out what the constant (k) is. We can do that by plugging in the first coordinates into the equation.
y = kx
10 = 6k
10/6 = k
We can solve for y by plugging this constant, and the second coordinate into the equation.
y=kx
y=10/6(24)
y=40
A way to solve this is finding 90% of 428.
428 × 0.90 = 385.2
Rounded, the answer is 385
Answer:
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Step-by-step explanation:
