A number that has a negative sign in front of it, opposite from positive numbers, and below zero are all phrases that can describe negative numbers.
Hope this helps.
Answer:
The value of x is 8cm. The length of 3 sides are 8cm, 15cm and 17cm.
Step-by-step explanation:
Using Pythagoras' Theorem, a²+b² = c² :
Let a be x cm,
Let b be x+7 cm,
Let c be 2x+1 cm
x² + (x+7)² = (2x+1)²
x² + x² + 14x + 49 = 4x² + 4x + 1
2x² + 14x + 49 = 4x² + 4x + 1
Then, move all the variables to one side and solve it to find the value of x :
4x² + 4x + 1 - 2x² - 14x - 49 = 0
2x² - 10x - 48 = 0
2(x² - 5x - 24) = 0
x² - 5x - 24 = 0
(x-8)(x+3) = 0
x - 8 = 0
x = 8 cm
x + 3 = 0
x = -3 cm (rejected)
Substitute the x value into the length of a,b and c :
a = x
= 8 cm
b = x + 7
= 8 + 7
= 15 cm
c = 2x + 1
= 2(8) + 1
= 16 + 1
= 17 cm
Recognize the differnce of 2 perfect squares
a²-b²=(a-b)(a+b)
so
Answer:
The answer to c is an arc
Marcus
Weeks Total Saved (x, y)
1 10 (1,10)
2 20 (2, 20)
3 30 (3 30)
4 40 (4, 40)
David
Weeks Total Saved (x, y)
1 15 (1, 15)
2 30 (2, 30)
3 45 (3, 45)
4 60 (4, 60)