Dalam 30 hari seorang menabung 1 dolar. Berapa rata-rata tabungannya setiap hari? (Tuliskan dalam bentuk pecahan bukan desimal)
Answer (3)
v 1 = 70 km / h v 2 = 80 km / h t = 2 h v = t s → s = v t s 1 = 70 km / h ⋅ 2 h = 140 km s 2 = 80 km / h ⋅ 2 h = 160 km l oo k a t t h e p i c t u re
21 8 2 = 14 0 2 + 16 0 2 − 2 ⋅ 140 ⋅ 160 ⋅ cos α 47524 = 19600 + 25600 − 44800 cos α 47524 = 45200 − 44800 cos α 44800 cos α = 45200 − 47524 44800 cos α = − 2324 / : 44800 cos α ≈ − 0.051875 ⇒ α ≈ 9 2 o 5 8 ′
The angle at which the two roads meet is approximately 92 degrees and 59 minutes. This was calculated using the Law of Cosines based on the distances traveled by each car. After evaluating the cosine value, we found the angle to be about 93 degrees.
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Penjelasan dengan langkah-langkah:rata-rata= total/jumlah harirata-rata= $1/30 hariSemoga membantu
