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3 years ago

What is the coefficient

Mathematics

2 answers:

7nadin3 [17]3 years ago

7 0

It has to be answer B.

Vlada [557]3 years ago

3 0

Answer:

Step-by-step explanation:

Using the Pascal's triangle

Pertaining to the 8th term the coefficients are;

1, 8, 28, 56, 70, 56,28, 8 and 1 in that order

Expanding this,

the coefficient of the term x^7y is 8

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Pipe A can fill a tank in 5 hours. Pipe B can fill it in 2 hours less time than it takes pipe C, a draining pipe, to empty the t

sukhopar [10]

Answer: Time taken by pipe C to empty the tank = 5 hours.

Step-by-step explanation:

Pipe A can fill a tank in 5 hours.

Let time taken by Pipe C = x ( hours)

Time taken by Pipe B = x-2 ( hours)

Now, with all 3 pipes open, it takes 3 hours to fill the tank, it can be represented as

$\dfrac15+\dfrac1{x-2}-\dfrac1x=\dfrac 13\\\\\Rightarrow\ \dfrac{x-(x-2)}{x(x-2)}=\dfrac13-\dfrac15\\\\\Rightarrow\ \dfrac{x-x+2}{x^2-2x}=\dfrac{5-3}{15}\\\\\Rightarrow \dfrac{2}{x^2-2x}=\dfrac2{15}\\\\\Rightarrow\ x^2-2x=15\\\\\Rightarrow\ x^2-2x-15=0\\\\\Rightarrrow\ x^2-5x+3x-15=0\\\\\Rightarrow\ x(x-5)+3(x-5)=0\\\\\Rightarrow\ (x-5)(x+3)=0\\\\\Rightarrow\ x=5, -3$

Time cannot be negative,

So, x=5

Thus, Time taken by pipe C to empty the tank = 5 hours.

8 0

3 years ago

John is hiking in the San Juan National Forest. Every 4 hours his elevation increases between 140 and 210 feet. 36 hours ago, Jo

Ksju [112]

Answer D. It is the closets answer to my calculations so im sorry if im wrong

8 0

3 years ago

A number x more than −13 as an expression

serg [7]

Answer:

x > -13

General Formulas and Concepts:

Algebra I

Writing expressions

Step-by-step explanation:

Step 1: Translate

"a number x" = s

"more than" is >

"-13" = -13

Step 2: Combine

x > -13

And we have our final answer!

4 0

3 years ago

OK SO I PUT IT AS 117 DEGREES BUT IM NOT SURE IF ITS RIGHT SO CAN SOMEONE PLEASE CONFIRM FOR ME BEFORE I SUBMIT?

Marysya12 [62]

It’s correct.
39 x 3 =117

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3 years ago

Read 2 more answers

Jared is taking his family to the amusement park. The cost of one ticket for x rides is given by the function f(x) = 2x + 8, whe

givi [52]

H(x) = 14x + 42
i hope this helped

4 0

3 years ago