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3 years ago

Solve this equation 1 . B/-7 = 4

Mathematics

2 answers:

weqwewe [10]3 years ago

8 0

Step-by-step explanation:

B/-7 = 4

Cross multiple

-7×4 = B

-28 = B

borishaifa [10]3 years ago

4 0

Answer:

-28

Step-by-step explanation:

First, multiply 4*-7= -28.

You're done. B=-28

Hope this helps!

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For the function y=x^2-4x-5, perform the followingtasks:

lbvjy [14]

Answer:

a. $x^2-4x-5= \left(x-2\right)^2-9$ .

b. The axis of symmetry for ${\left(x - 2\right)^{2}} - 9$ is $x=2$ .

Step-by-step explanation:

a. The vertex form of a quadratic is given by $y=a(x-h)^2+k$ , where (h, k) is the vertex.

To convert from $y=x^2-4x-5$ form to vertex form you use the process of completing the square.

Step 1: Write $x^2-4x-5$ in the form $x^2+2ax+a^2$ . Add and subtract 4:

$x^{2} - 4 x - 5=x^{2} - 4 x + {\left(4\right)} - {4} - 5$

Step 2: Complete the square $x^2+2ax+a^2=\left(x+a\right)^2$

${\left(x^{2} - 4 x + 4\right)} - 9={\left(x - 2\right)^{2}} - 9$

b. The graph of a quadratic function is a parabola. The axis of symmetry of a parabola is a vertical line that divides the parabola into two congruent halves. The axis of symmetry always passes through the vertex of the parabola. The x-coordinate of the vertex is the equation of the axis of symmetry of the parabola.

For a quadratic function in standard form, $y=a(x-h)^2+k$ , the axis of symmetry is $x=h$ .

The axis of symmetry for ${\left(x - 2\right)^{2}} - 9$ is $x=2$ .

Look at the graph shown below.

5 0

3 years ago

Can someone teach me how to divide?? :((

Anni [7]

It's easy just do the long way version do you know what way?

7 0

3 years ago

Two cars that are 150 miles apart start driving toward each other on parallel roads. The average speed of the first car is 60 mi

Semmy [17]

Answer:

60T + 55T = 150

Step-by-step explanation:

$T(60+55)=150\\115T=150$

$T=150/115=1.304 hr$

The cars takes 1.304 hrs (1h 18 min aprox) to pass each other

Hope this helps

5 0

2 years ago

A bag contains 1 gold marbles, 6 silver marbles, and 29 black marbles. Someone offers to play this game: You randomly select one

pentagon [3]

Answer:

the expected value is -$1

7 0

3 years ago

Read 2 more answers

Which relation is a function?

7nadin3 [17]

Answer:

Bottom left

Step-by-step explanation:

A function cannot have more than one y value for any x value, hold a piece of paper up as a vertical line test. If the line on the graph intersects your vertical line more than once, it is not a function.

8 0

3 years ago