Question

If (x + 5)^2 = 35, what is the approximate positive value of x?

0.92

2.65

3.16

5.48

Answer 1

my answer is
A

Answer 2

\[x + 5 = +/- \sqrt{35}\]
Question asks for the positve value of x.
So we have \[x = -5 + \sqrt{35}\]
because
\[x = -5 - \sqrt{35}\]
is negative.
You can use a calculator or google to get the approximate value of this.

Answer 3

I got A too but i'm not sure

Answer 4

That's what I get too.

Answer 5

yeah its A, thanks guys, can you help me on another question, its harder than this one

Answer 6

go ahead

Answer 7

sure

Answer 8

Debbie sells cookies and hotdogs. The daily cost of making cookies is $460 more than the difference between the square of the number of cookies sold and 20 times the number of cookies sold. The daily cost of making hotdogs is modeled by the following equation:

C(x) = 2x2 - 80x + 1,200

C(x) is the cost in dollars of selling x hotdogs.

Which statement best compares the minimum daily cost of making cookies and hotdogs?

It is greater for hotdogs than cookies because the approximate minimum cost is $300 for cookies and $392 for hotdogs.

It is greater for hotdogs than cookies because the approximate minimum cost is $360 for cookies and $400 for hotdogs.

It is greater for cookies than hotdogs because the approximate minimum cost is $400 for cookies and $360 for hotdogs.

It is greater for cookies than hotdogs because the approximate minimum cost is $392 for cookies and $300 for hotdogs.

Answer 9

my answer is C

Answer 10

or B, not sure though

Answer 11

dC(x)/dx = 2x - 20 = 0 => x = 10
=> minimum cost of cookies = 460 + 10^2 - 20(10) = 360
dH(x)/dx = 4x - 80 = 0 => x = 20
=> minimum cost of hotdogs = 1200 + 2(20^2) - 80(20) = 400

Answer 12

so it was B

Answer 13

So it appears.

Answer 14

ok and last one ..

A quadratic equation is shown below:

x2 - 8x + 13 = 0

Which of the following is the first correct step to write the above equation in the form (x - p)2 = q, where p and q are integers?

Subtract 5 from both sides of the equation

Subtract 3 from both sides of the equation

Add 5 to both sides of the equation <-- my answer

Add 3 to both sides of the equation

Answer 15

Back in a few minutes ...

Answer 16

\[( x - p)^{2} = x^{2} - 2p + p ^{2}\]
Compare the equation you have been given with this one. Then -2p = -8 and therefore p =4.
With this value of p we get \[x^{2} - 8x + 16\]
and we want to make the original equation into this so we subtract 3 from both sides.

Answer 17

yeah i already finished this question but thanks

Answer 18

will you help me on a new question please ? @BillBell