Subtracting Integers
Subtract +9 - +4 =
Add The Opposite +9 + -4 =
Result +5
Answer:
Area of the triangle = 210 cm^2 .
Step-by-step explanation:
Perimeter of triangle = 4x + 1 + 3x - 1 + 3x = 70
10x = 70 - 1 + 1 = 70
x = 7.
Area A = 1/2 * base * height
= 1/2 * 3x * (3x - 1)
= 1/2 * 3(7) * (3(7) -1)
= 1/2 * 21 * 20
= 210.
The expression with the smallest value is D
A=A1+A2+A3+A4
A1 (the base)=5×15/2=37.5
A2=A3 (the sides)
A2=15×9/2=67.5
A4=17×15/2=127.5
A=37.5+67.5×2+127.5
A=300