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julia-pushkina [17]
3 years ago
10

What is 13 D + 8 equals -1solve for d​

Mathematics
1 answer:
alexandr1967 [171]3 years ago
6 0

Answer:

D= -9/13

Step-by-step explanation:

13d+8−8=−1−8

13d=−9

13d /13  =  −9 /13

Hope this helps!

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HELP?!? idk what im doing and nobody has asked this. will give brainliest answrr or whatever its called.
Illusion [34]

9514 1404 393

Answer:

  \textbf{A.   }x=\dfrac{-4\pm2\sqrt{13}}{3}

Step-by-step explanation:

First of all, subtract 12 from both sides of the equation to put it into standard form:

  3x² +8x -12 = 0

Then identify the a, b, c of this form:

  ax² +bx +c = 0

You see that a=3, b=8, c=-12.

Now use those values in the quadratic formula for the solutions:

  x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\x=\dfrac{-8\pm\sqrt{8^2-4(3)(-12)}}{2(3)}\\\\x=\dfrac{-8\pm\sqrt{208}}{6}=\dfrac{-8\pm4\sqrt{13}}{6}\\\\\boxed{x=\dfrac{-4\pm2\sqrt{13}}{3}}\qquad\text{factor 2 from numerator and denominator}

6 0
3 years ago
What's an expression that can be used to multiply 6 x 198 mentally
disa [49]
Sense it is metal math you do 6 x 200
 <span />
3 0
3 years ago
Read 2 more answers
Pls help meee!!!!!!!!!<br> Pls show your work pls and thank u
nikdorinn [45]

Answer: x = 40

Step-by-step explanation:

these two angles are vertical angles, they will equal each other

therefore, move numbers and variables to the opposite sides of the = sign to isolate the X

3x-10 = 2x + 30

   +10        +10           move the -10 by doing opposite

_____________

3x = 2x + 40

-2x   -2x                    move -2x by doing opposite

____________

x = 40

you can check your work by substituting 40 in place of x

3(40) - 10 = 2(40) +30

120-10 = 80 + 30

110 = 110

answer is correct

8 0
2 years ago
Read 2 more answers
A health club charges non-members $5 per day to swim and $9 per day for an exercise class. Members pay a yearly fee of $300 plus
Ivahew [28]

The number of days d, he must use the gym to make the membership worthwhile is at least 21 days

Equation

Non members:

Cost of swimming per day = $5

Cost of exercise per day = $9

Total = $5 + $9

= $14

Members:

Yearly fee = $300

Exercise fee per day = $4

Swimming fee = $0

The number of days d, he must use the gym to make the membership worthwhile = $300 ÷ 14

= 21.42857142857142

Approximately,

21 days

Learn more about equation:

brainly.com/question/2972832

#SPJ1

5 0
1 year ago
Simplify the following expression.<br> -14x^2+9x-4x^2+5
Naya [18.7K]

Answer:

i think the answer is -18x^(2)+9x+5

-18x^(2)+9x+5

Subtract 4x^2 from  −14x^2

3 0
3 years ago
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