A new type of pump can drain a certain pool in 3 hours. An older pump can drain the pool in 9 hours. How long will it take both
2 answers:
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1. - 4 =
=> x = - 36
___________
2. -18 = 6t
=> t =
=> t = -3
___________
3. x - 18 = -72
=> x = - 72 + 18
=> x = - 54
___________
4. -18 = x - 15
=> x = -18 + 15
=> x - 3
The dimensions are 4.5 x 8.5.
Answer:
Step-by-step explanation:
<u>Question 1</u>
<u>Part (a)</u> :
⇒ 6 × 6 × 6 × 6 × 6 × 6 × 6 = 6ˣ
⇒ 6⁷ = 6ˣ
⇒ x = 7
<u>Part (b)</u> :
⇒ y² = 169
⇒ √y² = √169
⇒ y = ± 13
⇒ y = 13, y = -13
<u>Question 2</u>
<u>Part (a)</u> :
⇒ (√5)² × (√3)²
⇒ 5 × 3
⇒ 15
<u>Part (b)</u> :
⇒ (∛9)³ × (√30)²
⇒ 9 × 30
⇒ 270