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4 years ago

How to to this?Can you please help?1.A

Mathematics

1 answer:

eimsori [14]4 years ago

8 0

First you need to expand them
(x^2 + 9) + (2x + 6)
then you add them together

x^2 + 2x + 15
now you can factorise it

i hope this helped you

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Simplify -2 1/6 - ( -7 1/3 )

givi [52]

Answer:

5 1/6

Step-by-step explanation:

Note that - ( -7 1/3) = 7 1/3. The two ' - ' signs cancel each other.

Thus, the original expression becomes -2 1/6 + 7 1/3.

Here the LCD is 6. We re-write the above expression as -2 1/6 + 7 2/6.

Reversing the order of these terms makes the work a bit easier.

7 2/6 - 2 1/6 comes out to 5 1/6

6 0

3 years ago

Help answering thjs

irina [24]

Answer:

2x-0=x+2

2x=x+2

2x-x=2

x=2

4y-8=y+10

4y-y=10+8

3y=18

y=6

AB=2×2+0=4 (DC is 4 too)

AD=4×6-8=24-8=16 (BC is 16 too)

4 0

3 years ago

Can someone please help me with these questions?

nikitadnepr [17]

QUESTION 1

The given function is

$y = - 6x - 13$

The domain of this function refers to all values of x for which y is defined.

The given function is defined for all real values of x.

The domain is all real numbers.

The correct answer is A

QUESTION 2

The equation in column 1 is

$y = - 2 {x}^{2} - 4x + 12$

We obtain the vertex form as follows;

$y = - 2( {x}^{2} + 2x) + 12$

$y = - 2( {x}^{2} + 2x + {1}^{2}) - - 2 {(1)}^{2} + 12$

$y = - 2({(x + 1)}^{2}) + 2 + 12$

$y = - 2({x + 1)}^{2} + 14$

The x-value of the vertex is -1.

The equation in column 2 is

$y = {x}^{2} - 4x + 3$

We can also find the x-value of the vertex using the formula,

$x = - \frac{b}{2a}$

$x = - \frac{ - 4}{2(1)}$

$x = 2$
The correct answer is

B) The value found in column #1 is less than the value found in column #2

QUESTION 3

The height of the ball is modeled by

$h(t) = - 16 {t}^{2} + 64t$
where t equals the time in seconds and h(t) represents the height of the ball at time t seconds.

The axis of symmetry can be found using the formula,

$t = - \frac{b}{2a}$

$t = - \frac{ 64}{2( - 16)}$

$t = 2$

The correct answer is

A) t=2; it takes 2 seconds to reach maximum height and 2 seconds to fall back to the ground

QUESTION 4

The equation of axis of symmetry is given by the formula,

$x = - \frac{b}{2a}$

For the axis of symmetry of a given quadratic function to be zero, then the b-value of quadratic function should be zero.

The only equation from the given options whose b-value is zero is

$y = {x}^{2} + 2$

The axis of symmetry is

$x = - \frac{0}{2(1)}$

$x = 0$

The correct answer is C

3 0

3 years ago

a store owner needs a rug with an area of at least 420 square feet select all that the store owner could use A 40 feet x 20 feet

HACTEHA [7]

Answer:

que

Step-by-step explanation:

no sé

3 0

3 years ago

What is the mean for 87,93,86,90,84

lys-0071 [83]

Mean, or average, is solved by adding all the numbers and dividing by the number of numbers. The answer is 88.

4 0

3 years ago

Read 2 more answers