MATHEMATICS HIGH SCHOOL

What is 2n + -3 + 7 + 9

Answers

Answer 1

Answer: 2n + -3 + 7 + 9
Answer : 2n+13

Answer 2

Answer:

Answer:

2+ 13

Step-by-step explanation:

2n - 3 + 7 + 9

2n + 13

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Which statement about square root x-5 - square root x = 5 is true?a) x = –3 is a true solution.
b) x = –3 is an extraneous solution.
c) x = 9 is a true solution.
d) x = 9 is an extraneous solution.

Answers

Hello,

Answer D

$√(x-5) - √(x) =5$
==> $(x-5) -2*√((x-5)x)+x =25$
==> $2x-30=√(x(x-5))$
==> $x-15=√(x(x-5))$
==> $x^2-30x+225=x(x-5)$
==> $225=-5x+30x$
==> $25x=225$
==> $x=9$
But:

$√(9-5) - √(9)=√(4) - √(9)=2-3=-1$ ≠5

Explanation:

$\lim_(x \to \infty) √(x-5)- √(x)$

$= \lim_(x \to \infty) \frac{(√(x-5)- √(x))*(√(x-5)+ √(x))} {√(x-5)+ √(x)}$

$= \lim_(x \to \infty) ((-5))/(√(x-5)+ √(x))$

$= \lim_(x \to \infty) (-5)/(\infty)=0$

How do you solve 5[2p−4(p+5)]=25 properly?

Answers

Answer:

Step-by-step explanation:

5[2p-4(p+5)]=25

or, 2p-4(p+5)=5

or, 2p-4p-20=5

or, -2p=5+20

or, -2p=25

or, 2p=-25

or, p=25/2

so, p=12.5

Solve the system of equations below by graphing both equation . what is the solution?

Answers

y=2x-3
y=-2x+5
2x-3 = -2x+5
4x=8
x=2
y=2(2)-3
y=1
the answer is A.(2,1)

Explain what the point (20,160) represents in the context of the situation? Check all boxes that apply A. 160 shirts cost $20B. 20 shirts cost $160
C. 20,160 shirts cost money
D. The total cost of shirts is 20,160

Answers

Answer:

option B is correct option.

Step-by-step explanation:

Explain what the point (20,160) represents in the context of the situation? Check all boxes that apply

Looking at the graph we come to know that 20 shirts cost $160 because x -axis represent number of shirts and y-axis represent Total Cost

So, the point(20,160) means x = 20 and y=160

We have 20 shirts and the cost is $160

So, option B is correct option.

How to solve linear equations by substitution?

5x+2y=9
x+y=-3

Answers

5x+2y=9 x+y=3

change x+y=3 into x=3-y

plug that equation into 5x+2y=9 where x is.

5(3-y)+2y=9

then distribute.

15-5y+2y=9

15-7y=9

minus 15.

-7y=-6

divide both sides by -7.

y is equal to -6/7.

then go back to the first equation and plug in for y.

and then you will get x.

then you will have (y,x)

$\begin{cases} 5x+2y=9 \n x+y=-3\end{cases} \n \n\begin{cases} 5x+2*(-3-x)=9 \n y=-3 -x\end{cases} \n \n\begin{cases} 5x-6-2x =9 \n y=-3 -x\end{cases}\n \n\begin{cases} 3x =9+6 \n y=-3 -x\end{cases}$

$\begin{cases} 3x =15 \ \ /:3 \n y=-3 -x\end{cases} \n \n\begin{cases} x =5 \n y=-3 -5\end{cases} \n \n\begin{cases} x =5 \n y=-8\end{cases}$

Which of the following could be the third side of an obtuse triangle with the other two side lengths of 6 and 7.5
8
9
10

Answers

Pythagorean theorem.
a^2+b^2=c^2
6^2+7^2=c^2
36 + 49 = c^2
85 = c^2
sqrt of 85 = 9.22

So the best answer would be C. 9

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