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3 years ago

3 more than twice a number is 15 what is the number

Mathematics

2 answers:

Mnenie [13.5K]3 years ago

6 0

2x+3=15

2(6)+3=15
12+3=15 ✅

vredina [299]3 years ago

4 0

The number is 6 for this

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Y=-2x²-8x-5 domain and range

Jobisdone [24]

Answer:

Domain: All real numbers

Range: y≤3

Step-by-step explanation:

The given function is

$y = - 2 {x}^{2} - 8x - 5$

This is a polynomial function.

The domain is set of all values of x, that makes this function defined.

Since polynomial functions are defined everywhere, the domain is all real numbers.

To find the range we put the function in vertex form:

$y = - 2( {x}^{2} + 4x) - 5$

$y = - 2( {x}^{2} + 4x + 4) - 5 + - 4 \times - 2$

$y = - 2( {x} + 2)^{2} - 5 + 8$

$y = - 2( {x} + 2)^{2} + 3$

The maximum value is 3

The function turns downward, hence the range is:

$y \leqslant 3$

6 0

3 years ago

What is the inverse to 2^x-1

nydimaria [60]

Replace x with y and solve for y~

y=2*

x=2^y

log x = y log 2

y=log x / log 2

Hope this helps and leave a brainliest to help me reach expert ;)

4 0

3 years ago

-4 (5y + 5) = -120 y =

Sedbober [7]

-4 (5y + 5) = -120

multiply the bracket by -4

(-4)(5y)=-20y

(-4)(5)=-20

-20y-20=-120

move -20 to +20

-20y-20+20=-120+20

-20y=-120+20

-20y=-100

divide both sides by -20 to get y by itself

-20y/-20=-100/-20

Answer: y=5

6 0

3 years ago

Read 2 more answers

What is 1+9x3(2x+32)<br> plesse help me if you know it thank you for the help.

hjlf

Answer:

18x^4+288x^3+1

Step-by-step explanation:

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5 0

3 years ago

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Statements showing a relationship between numbers that are not necessarily equal using the symbols >, <, ≥, ≤, or ≠ are ca

likoan [24]

3.) Inequalities.
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7 0

3 years ago