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dimpleschris101
25.07.2021 •
Mathematics
Giải bài toán sau đây bằng cách lập phương trình: Một nhóm bạn học sinh lên kế hoạch mỗi ngày sẽ làm 20 kính chắn giọt bắn để tặng cho các y bác sĩ đang tham gia chống dịch. Nhưng khi thực hiện thì mỗi ngày nhóm làm được 25 cái. Do đó nhóm không những đã hoàn thành trước thời hạn 2 ngày mà còn vượt mức 35 cái. Tính số kính chắn giọt bắn mà nhóm định làm theo kế hoạch.
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Ответ:
Part 1
Given equation:
C(t) = -0.30 (t – 12)² + 40
For t = 0
C(t) = -0.30 (0 - 12)² + 40
C(t) = -0.30 (-12)² + 40
C(t) = -3.2
For t = 12 (noon)
C(t) = -0.30 (12 - 12)² + 40
C(t) = -0.30 (0)² + 40
C(t) = 40
For t = 24 (midnight)
C(t) = -0.30 (24 - 12)² + 40
C(t) = -0.30 (12)² + 40
C(t) = -0.30 × 144 + 40
C(t) = - 43.2 + 40
C(t) = -3.2
Part 2
attached below
Part 3
C(t) = –0.30(t – 12)² + 40
F(t)=9/5C(t)+32
Substituting the values:
F(t)=9/5{–0.30 (t – 12)² + 40}+32
F(t) = -0.54 (t – 12)² + 72 + 32
F(t) = -0.54 (t – 12)² + 104
5, 6 and 7, should be simplish
good luck, i hope this helps :)
Step-by-step explanation: