Berikut ini adalah pertanyaan dari michelle711 pada mata pelajaran Matematika untuk jenjang Sekolah Menengah Atas
2.Rihanna wants to lose 15 kg. She initially loses 8 kg, then gains 2 kg per week for 3 weeks, then loses 9 kg. How much weight must Rihanna Now lose to reach her goal?
3.There are 180 white balls in a basket. Clarissa takes out 6 white balls from the basket and replaces them with 15 purple pencils. She continues to do so till all the white balls are replaced by the purple pencils. Find the total number of purple pencils in the basket !
4.Deviena went to a furniture store with his friend and had $1000 in cash in his wallet. When paying for 6 pieces of furniture, he did not have enough money and borrowed $666 from his friend. What is the average price of the furniture he bought?
I'm very sorry this will take a few minutes until hours to figure this out
Jawaban dan Penjelasan
Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.
Penjelasan dengan langkah-langkah:
1. Total temperature change = final temperature - initial temperature
= (-4) - 16
= -20
Number of hours = 5
Average temperature change per hour = total temperature change / number of hours
= -20 / 5
= -4
Therefore, the average temperature change per hour is -4 degrees Celsius.
2.. Initial weight loss = 8 kg
Weight gain in 3 weeks = 2 kg/week x 3 weeks = 6 kg
Final weight loss = 9 kg
Net weight loss/gain = -8 kg + 6 kg - 9 kg = -11 kg
Rihanna's target weight loss = 15 kg
Amount of weight she has already lost or gained = -11 kg
Therefore, to reach her goal, Rihanna still needs to lose:
15 kg - (-11 kg) = 26 kg
Rihanna needs to lose 26 kg to reach her goal.
3. After Clarissa replaces 6 white balls with 15 purple pencils, there are 180 - 6 + 15 = 189 items in the basket.
In the second round, Clarissa replaces another 6 white balls with 15 purple pencils, so now there are 189 - 6 + 15 = 198 items in the basket.
She continues to do this until all the white balls are replaced by purple pencils, so the total number of rounds she does this is (180 / 6) = 30 rounds.
Therefore, the total number of purple pencils in the basket is 15 x 30 = 450.
4. If Deviena borrowed $666 from his friend, then he had $1000 + $666 = $1666 to pay for the furniture.
Let the total price of the 6 pieces of furniture be x. Then, we can set up the equation:
x + $666 = $1666
Simplifying, we get:
x = $1000
Therefore, the total price of the furniture is $1000. To find the average price, we divide by the number of pieces:
$1000 / 6 = $166.67
So the average price of the furniture Deviena bought is $166.67
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Last Update: Sat, 15 Jul 23