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3 years ago

Help me with this please.

Mathematics

2 answers:

Vilka [71]3 years ago

6 0

I believe C. Sorry if I’m wrong!

Alenkasestr [34]3 years ago

3 0

Answer:

i would go with D????

Step-by-step explanation:

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What number must be added to the expression below to complete the<br> square?<br> x² - 18x

kiruha [24]

Answer:

$\boxed {\boxed {\sf 81}}$

Step-by-step explanation:

The standard form of a quadratic is:

$ax^2+bx+c$

To complete the square, the a (leading coefficient) must be 1 and there can only be terms with variables on one side.

The expression given:

$x^2-18x$

follows these rules. Next, we divide the b (linear coefficient) by 2, then square it. Basically:

$(\frac{b}{2})^2$

The b in the expression is -18.

$(\frac{-18}{2})^2$

$(-9)^2= -9*-9= 81$

This is the number that is added.

5 0

3 years ago

Help pls I’ll give extra points

Svet_ta [14]

Answer:

increases

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

Or which equation would x = 4 be a solution?

ElenaW [278]

$2x+7=22\ \ \ \ |-7\\2x=15\ \ \ \ \ |:2\\x=7.4\neq4\\----------------------\\6x\div8=3\ \ \ \ |\cdot8\\6x=24\ \ \ \ |:6\\x=4\\-------------------\\8-3x=20\ \ \ \ |-8\\-3x=12\ \ \ \ |:(-3)\\x=-4\neq4\\---------------------\\2x+8=4\ \ \ \ \ |-8\\2x=-4\ \ \ \ \ |:2\\x=-2\neq4\\\\Answer:\ 6x\div8=3$

Other method.

Enter the value of x for each equation and check the equality of the pages of the equation

$2x+7=22\\L=2(4)+7=8+7=15;\qquad R=22\qquad L\neq R\\\\6x\div8=3\\L=6(4)\div8=24\div8=3;\qquad R=3;\qquad L=R\\\\8-3x=20\\L=8-3(4)=8-12=-4;\qquad R=20;\qquad L\neq R\\\\2x+8=4\\L=2(4)+8=8+8=16;\qquad R=4;\qquad L\neq R$

6 0

3 years ago

Pi times x divided by 2 equals y

pochemuha

Answer:

divide both sides by 1.57 so

x=0.636943y

5 0

3 years ago

Please help with number 4

Scilla [17]

Answer:

B) 16

Step-by-step explanation:

5 tickets = $15

15/5=3

1 ticket = $3

48/3 = 16

16 tickets for $48

3 0

3 years ago