Step-by-step explanation:
(n + 7)² – n²
n² + 14n + 49 – n²
14n + 49
7 (2n + 7)
7 is a factor, so for any natural n, (n + 7)² – n² is a multiple of 7.
Answer: x > -8
Step-by-step explanation:
3x - 17 < 4x - 9 subtract 3x from both sides, and add 9 to both sides
<u> -3x + 9 < -3x + 9</u>
0 - 8 < x + 0 Rewrite and reverse the sign to simplify
x > -8
Answer:
what grade yo.u in
Step-by-step explanation:
..
48 divide by 4 sides = 12
12 x 12 = 144cm squared
Answer:
54 cm
Step-by-step explanation:
The area (A) of an equilateral triangle is
A =
( s is the side length ) then
= 81
( multiply both sides by 4 to clear the fraction )
s²
= 324
( divide both sides by
)
s² = 324 ( take the square root of both sides )
s =
= 18
Thus
perimeter = 3 × 18 = 54 cm