2 years ago

Evaluate 2d+3 when d=8

Mathematics

2 answers:

Aneli [31]2 years ago

8 0

Answer:

2(8)+3= 19

Step-by-step explanation:

Kitty [74]2 years ago

6 0

Answer:

Step-by-step explanation:

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A coach spends a total of $435 to buy a uniform and a soccer ball for each of the 15 players on the team. The cost of each socce

ale4655 [162]

15 players times the uniforms(x) and the cost of the ball equals the total spent 15(x+8)=435

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1 year ago

Jennifer is a lifeguard at the same pool. She earns $220.50 for 18 hours of lifeguarding. How much does Jennifer earn per hour?A

Alex

Answer:

b.12.25

Step-by-step explanation:

You just simply divide 220.50 by 18 and you will end up with the rate per hour.

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2 years ago

If the fraction 396\x-10 is equivalent to -22. find the value of x.

slavikrds [6]

396/x-10
396/x-10 = -22
Multiply to remove the variable from the denominator.
x= -8

If you want to check the work do it by adding -8 into the equation as x.

I hope this helps!

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2 years ago

Please help me answer this question genius

kolbaska11 [484]

Answer:

x ∈ {-0.465, 1.014}

Step-by-step explanation:

The equation can be cast in the form f(x) = 0, and solved easily using a graphing calculator. That shows x ≈ -0.465 and x ≈ 1.014. The same calculator can iterate the roots to full calculator precision.

The equation can be made a quadratic by the substitution ...

z = e^(2x)

Then we have ...

$2\cosh(2x)-\sinh(2x)=4\\\\2\cdot\dfrac{e^{2x}+e^{-2x}}{2}-\dfrac{e^{2x}-e^{-2x}}{2}-4=0\qquad\text{use exponential identities}\\\\2z+2z^{-1}-z+z^{-1}-8=0\qquad\text{multiply by 2, substitute z}\\\\z^2 -8z+3=0\qquad\text{multiply by z}\\\\z=\dfrac{8\pm\sqrt{(-8)^2-4(1)(3)}}{2(1)}=4\pm\sqrt{13}\\\\x=\dfrac{\ln(z)}{2}=\dfrac{\ln(4\pm\sqrt{13})}{2}\approx\{-0465133,1.014439\}$

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1 year ago

Need help with my math homework

crimeas [40]

70 or 120 because either you multiple or addition

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3 years ago

Read 2 more answers