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dsp73
3 years ago
10

Finding a Percent of a Number

Mathematics
2 answers:
Alekssandra [29.7K]3 years ago
5 0

Answer:

1) 1.99

2) 1.4

Step-by-step explanation:

Greeley [361]3 years ago
4 0

Answer:

22.84

Step-by-step explanation:

El impuesto se calcula por 0.075 * 21.25 = 1.59375 o $ 1.59. Entonces, la factura total es el costo de los artículos comprados más impuestos, que es de $ 21.25 + $ 1.59 = $ 22.84.

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$30,000 is invested for 15 years with an APR of 4.5% and daily compounding.
Alex73 [517]

Answer:

202500

Step-by-step explanation:

15x0.45=6.75

30000x6.75=202500

6 0
2 years ago
A rectangle with sides measuring x in. and 4x-1 in. has an area of 663in.^2. What are the dimensions of the rectangle?
serious [3.7K]

9514 1404 393

Answer:

  13 in by 51 in

Step-by-step explanation:

The area is the product of the dimensions, so is ...

  663 = x(4x -1)

  4x^2 -x -663 = 0 . . . . . . subtract 663 to put in standard form

Using the quadratic formula, we can find the solutions.

  x = (-(-1) ±√((-1)^2 -4(4)(-663)))/(2(4))

  x = (1 ± √10609)/8 = (1 ±103)/8

Only the positive solution is of any use in this problem, so ...

  x = 104/8 = 13

  4x-1 = 4(13)-1 = 51

The dimensions of the rectangle are 13 inches by 51 inches.

__

I find it easiest to solve these using a graphing calculator.

8 0
3 years ago
Two pizza delivery drivers compared the mean numbers of deliveries they completed in one day.
marishachu [46]

Answer:

B

Step-by-step explanation:

I just did it Red Riot out

8 0
3 years ago
Read 2 more answers
How do i put 250 to 1000 as a fraction in its simplest form
shusha [124]
Divide 250 from 250 and 1000 to get 1/4.
4 0
3 years ago
Read 2 more answers
Explain how to find (f^-1)’(b), given that b=f(a).
Ganezh [65]

Answer:

(f⁻¹)'(b) = 1/f'(f⁻¹(b)) = 1/f'(a)

Step-by-step explanation:

The function f⁻¹(x) is the reflection of the function f(x) across the line y=x. Every point (a, b) that is on the graph of f(x) is reflected to be a point (b, a) on the graph of f⁻¹(x).

Any line with slope m reflected across the line y=x will have slope 1/m. (x and y are interchanged, so m=∆y/∆x becomes ∆x/∆y=1/m) Since f'(x) is the slope of the tangent line at (x, f(x)), 1/f'(x) will be the slope of the tangent line at (f(x), x).

Replacing x with f⁻¹(x) in the above relation, you get ...

... (f⁻¹)'(x) = 1/f'(f⁻¹(x)) will be the slope at (x, f⁻¹(x))

Putting your given values in this relation, you get

... (f⁻¹)'(b) = 1/f'(f⁻¹(b)) = 1/f'(a)

7 0
3 years ago
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