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3 years ago

Evaluate the expression when x = 1/2 and y = -5 11x - 8 ( x - y )

Mathematics

1 answer:

Law Incorporation [45]3 years ago

3 0

Answer:the answer is b

Step-by-step explanation:

bc you multiply 1/2 and 5 first then you subtract 11 1/2 by 8

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John has a boat that will travel at the rate of 15 kph in still water. He can go upstream for 35 km in the same time it takes to

Otrada [13]

Answer:

The boat traveling at 24 kph when John goes downstream.

Step-by-step explanation:

We are given the following in the question:

John has a boat that will travel at the rate of 15 kph in still water.

Let x be the speed of the current.

Speed of boat in upstream

$(15-x)\text{ kph}$

Speed of water in downstream

$(15+x)\text{ kph}$

Relation:

$\text{Speed} = \dfrac{\text{Distance}}{\text{Time}}$

We have to find the speed of boat in downstream.

Time to travel upstream for 35 km = Time to travel 140 km downstream

$\displaystyle\frac{35}{15-x}=\frac{140}{15+x}\\\\35(15+x) = 140(15-x)\\525 + 35x = 2100 - 140x\\175x = 1575\\x = 9$

Thus, speed of current is 9 kph.

Speed of boat in downstream = 15 + 9 = 24 kph.

Thus, the boat traveling at 24 kph when John goes downstream.

4 0

3 years ago

P+7+(3m+1)+2(m+p) simplify the expression

lukranit [14]

P+5m+2p+8

I believe.

Simply apply the rule of distributive property.

3 0

3 years ago

Help me on iready i need help

mash [69]

Answer:

13/20

Step-by-step explanation:

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3 years ago

Can someone please help me with this math . I've just entered High School and I hate it already.

Daniel [21]

-1+3(m+4)
-1+3m+12
11+3m

7 0

3 years ago

Find the value of C that makes the trinomial a perfect square

Dafna1 [17]

Answer:

${x}^{2} + 28x + 4$

Step-by-step explanation:

puting the value of x as 2

4+56+4=64

and 64 is the perfect square of 8

<h2>hope it helps you<3</h2>

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3 years ago