Step-by-step explanation:
the total surface area is the sum of the 5 individual areas in the surface :
2 triangle sides (left and right).
1 back rectangle side
1 rectangle floor
1 inclined rectangle front side
to get the length of the baseline (Hypotenuse) of the right-angled triangles on the side. we use Pythagoras
c² = a² + b²
where c is the Hypotenuse (the side opposite of the 90° angle).
c² = 3² + 4² = 9 + 16 = 25
c = 5
so, now, we have everything we need.
the area of a triangle side (since it is right-angled) :
4×3/2 = 6
2 sides, that makes 12
the area of the back side
6×3 = 18
the area of the floor
6×4 = 24
the area of the inclined front side
6×5 = 30
so, the total surface area is
12+18+24+30 = 84
<span>3.5y−12=1.5(y−2)
</span><span>3.5y−12=1.5y - 3
3.5y - 1.5y = -3 + 12
2y = 9
y =9/2
y = 4.5</span>
Answer:
C
Step-by-step explanation:
Use distributive property =====> multiply everything inside the parentheses by 9 to get answer C
Answer:
n=-4
Step-by-step explanation:
0.5n-9=4n+5
-14=3.5n
Divide -14/3.5
n=-4
73, every number is in the same range except 73