What is the price of a $18 book after a 15% discount?

Mathematics

2 answers:

Bezzdna [24]3 years ago

5 0

Answer:

$15.3

Step-by-step explanation:

15% divided by 100

0.15

0.15*18=2.7

18-2.7=15.3

nordsb [41]3 years ago

3 0

15.3 because divide 15 by 100

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A square with side x is changing with time where x(t)=3t+1. What is rate of change of the area of the square when t=2 seconds.

GuDViN [60]

Answer:

Rate of change of the area of the square is 42 units at t = 2.

Step-by-step explanation:

We note that the area of the square is given by: $A(x) = x^2$ but we aim to find $\frac{dA}{dt}$ . But we can use the chain rule to pull out that dA/dt. Doing so gives us:

$\frac{dA}{dt} = \frac{dA}{dx} \times \frac{dx}{dt}.$

Now, $\frac{dA}{dx} = 2x$ (by the power rule and $\frac{dx}{dt} = 3.$

But since we have "x" and not "t", we want to find what x is when t = 2. Substituting t = 2 gives us x(2) = 3(2) + 1 = 7.

So, finally, we see that:

$\frac{dA}{dt} = 2(7) \times 3 = 14 \times 3 = 42.$

7 0

3 years ago

HELP FAST. ILL GIVE BRAINLIST. 100 pts for each answer.

Aleonysh [2.5K]

Ok so
The first division problem’s answer is 12.
The second division problems answer is 9.
The third division problem’s answer is 8.
Now put those as the denominators of the fractions.
If that isn’t what they’re asking for then I don’t know but I hope this helps!

5 0

2 years ago

Read 2 more answers

Circumference of a circle

solmaris [256]

Answer:

50.27 units

Step-by-step explanation:

The formula for the circumference of a circle is:

C = $\pi$ d