Answer:
- <u>First choice, 984 cm²</u>
Explanation:
The plastic pencil case has form of a triangular prism.
This triangular prism has five faces:
- Top and bottom faces: two congruent triangles with a 10 cm base and 12 cm height.
- Lateral faces: two congruent rectangles with a 24 cm length and 13 cm widht, and one rectangle with 24 cm length and 10 cm widht.
<u>Surface area:</u>
- <u>Top and bottom triangles</u>:
area = (1/2) base × height
area of one triangle = 10 cm × 12 cm × (1/2) = 60 cm²
area of the two triangles = 2 × 60 cm² = 120 cm²
- <u>Lateral rectangles:</u>
area of a rectangle = length × width
area of the trhee triangles = 24 cm × 10 cm + 2 × 24 cm × 13 cm = 240 cm² + 624 cm² = 864 cm².
- <u>Total area: </u>120 cm² + 864 cm² = 984 cm²
Answer: first choice, 984 cm²
Answer:
21.44
Step-by-step explanation:
50% = 1/2
1/2 of 42.88
42.88 ÷ 2
21.44
Hope this helps :)
Answer:
14.858
Step-by-step explanation:
you get your 1.2and add 2 more 0s to get it to the same amount of numerical digits as 16.058 then you write ur subtraction
16.058
-1.200
_____
and u subtract it normally
so ull get 14.858
Answer:
13
Step-by-step explanation:
h = 8
j = 11
3h - j
= 3(8) - 11
= 24 - 11
= 13
Answer:
<u>5x+13</u> ÷ 36 = 6x-2 ÷ 30
5x+13 ÷ 6 = 6x-2 ÷ 5
25x+65=36x-12
11x=77 → x=7
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Step-by-step explanation: