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Andru [333]
3 years ago
11

A motorboat travels 9 miles downstream (with the current) in 30 minutes. The return trip upstream (against the current) takes 90

minutesWhich system of equations can be used to find x, the speed of the boat in miles per hour, and y, the speed of the current in miles per hour? Recall the formula d = rt..
Mathematics
1 answer:
Ksju [112]3 years ago
8 0

Answer:

Option B

Step-by-step explanation:

When moving with the current, the speeds of the boat and current will add up. The first situation can then be represented by:

9 = 0.5(x + y)

While opposing the current, the speeds will be subtracted. Forming:

9 = 1.5(x - y)

The second option contains this equation system, so it is correct.

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Black_prince [1.1K]

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Read 2 more answers
1. f(x) = x(x-6)(x+3)
maks197457 [2]

Answer:

x3squared-3x2squared-18x

Step-by-step explanation:

1 Expand by distributing terms.

({x}^{2}-6x)(x+3)(x

​2

​​ −6x)(x+3)

2 Use the FOIL method: (a+b)(c+d)=ac+ad+bc+bd(a+b)(c+d)=ac+ad+bc+bd.

{x}^{3}+3{x}^{2}-6{x}^{2}-18xx

​3

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​2

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3 Collect like terms.

{x}^{3}+(3{x}^{2}-6{x}^{2})-18xx

​3

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​2

​​ −6x

​2

​​ )−18x

4 Simplify.

{x}^{3}-3{x}^{2}-18xx

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5 0
3 years ago
Which of the following properties completes the proof?
Tresset [83]

The subtraction property of inequality can be used to proof that x = 7 from  x + 8 = 15

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more variables and numbers.

Given that x + 8 = 15

Hence:

x + 8 - 8 = 15 - 8 (subtraction property of inequality)

x = 7

The subtraction property of inequality can be used to proof that x = 7 from  x + 8 = 15

Find out more on equation at: brainly.com/question/2972832

#SPJ1

6 0
2 years ago
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