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2 years ago

6

Help help help help help me please

1 answer:

Gala2k [10]2 years ago

4 0

Answer:

b. y < -9

Step-by-step explanation:

This is because > or < have a dashed boundary line and =< and >= have non-dashed lines.

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Factorize 2a^2+7a-15

loris [4]

$\huge\bf \pink {\underline{Solution :-}}$

$2 {a}^{2} + 7a - 15$

$= 2 {a}^{2} + 10a - 3a - 15$

$= 2a(a + 5) - 3(a + 5)$

$= (a + 5)(2a - 3)$

$\sf \red{Hence, Answer \: is \: (a + 5)(2a - 3).}$

$\\$

$\bf \purple{ \underline{ Important \: Formulas \: for \: Factorization :-}}$

$• \: {a}^{2} + 2ab + {b}^{2} = {(a + b)}^{2}$

$• \: (a + b)(a - b) = {a}^{2} - {b}^{2}$

$• \: {a}^{2} - 2 ab + {b}^{2} = {(a - b)}^{2}$

$• \: {a}^{3} + 3 {a}^{2} b + 3a {b}^{2} + {b}^{3} = {(a + b)}^{3}$

$• \: {a}^{3} - 3 {a}^{2} b + 3a {b}^{2} - {b}^{3} = {(a - b)}^{3}$

$• \: {(a + b)}^{2} + {(a - b)}^{2} = 2( {a}^{2} + {b}^{2} )$

$• \: {(a + b)}^{2} - {(a - b)}^{2} = 4ab$

$• \: (a + b)( {a}^{2} -ab + {b}^{2} ) = {a}^{3} + {b}^{3}$

$• \: (a - b)( {a}^{2} + ab + {b}^{2} ) = {a}^{3} - {b}^{3}$

$• \: {( \frac{a + b}{2} )}^{2} - ( {\frac{a - b}{2} } )^{2} = ab$

5 0

3 years ago

Read 2 more answers

PLEASE!! I NEED HELP

elixir [45]

Answer:

Option A, $\frac{1}{7}$

Step-by-step explanation:

<u>Step 1: Determine the numbers that are multiples of 3</u>

8 → Not a multiple of 3

9 → Multiple of 3

14 → Not a multiple of 3

19 → Not a multiple of 3

25 → Not a multiple of 3

34 → Not a multiple of 3

38 → Not a multiple of 3

<u>Step 2: Determine the probability of chosing a multiple of 3</u>

Since we only have 1 number that is a multiple of 3 out of the 7 given numbers, that means that we do the following:

$\frac{(1\ multiple\ of\ 3)}{7\ total\ numbers}$

$\frac{1}{7}$

Answer: Option A, $\frac{1}{7}$

6 0

2 years ago

Will 5x-3y>15 have a solid line

marysya [2.9K]

Answer:

The inequality $5x-3y >15$ have a dashed line

Step-by-step explanation:

we have

$5x-3y >15$

The solution of this inequality is the shaded area below the dashed line

The equation of the dashed line is $5x-3y=15$

The slope of the dashed line is positive

The y-intercept of the dashed line is -5 ---> point (0,-5)

The x-intercept of the dashed line is x=3 ----> point (3,0)

Graph the solution

see the attached figure

6 0

3 years ago

On the floor plan shown at the right 1.25 inches represents 2 feet. A. what is the actual length of the entire floor? B. what is

uranmaximum [27]

Answer:

3

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Proving Triangles congruent: ASA, AAS, SAS SSS

Mkey [24]

Answer:

WIR by SAS

EHS by AAS

GTN by SSS

7 0

2 years ago