Step-by-step explanation:
the last one is the correct answer
Answer:
14.0328
Step-by-step explanation:
Answer:
64 ft²
Step-by-step explanation:
10 ft · 10 ft
100 ft²
6 · 6 = 36
36 ÷ 2 = 18
18 ft² + 18 ft² = 36 ft²
100 ft² - 36 ft²
64 ft²
Fact #1:
A cube has six faces.
Fact #2:
Every one of them has the same area.
Fact #3:
The surface area of each face is (the length of the cube's side)²
Now that I look at this one more carefully, the only thing you need to know
to solve it is Fact #3. (But you can keep the others and save them for later.)
The surface area of each face is (the length of the cube's side)²
64 is the (length of the cube's side)²
Can you find a number that gives you 64 when you multiply it by itself ?
That's the length of the cube's side.
Hint: If you don't get ' 8 ', work on it a little more.
First, you need to figure out hoe many boys and girls there are.
40% = 0.4
0.4 x 20 = 8 boys
20 - 8 = 12 girls
25% of the boys have glasses
0.25 x 8 = 2 boys who wear glasses
50% of the girls have glasses
0.5 x 12 = 6 girls who wear glasses
2 + 6 = 8
8 students wear glasses
