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solniwko [45]
3 years ago
8

Select all the expressions that are equivalent to – ķ(15 – 20d + 5c).

Mathematics
1 answer:
galina1969 [7]3 years ago
3 0

Answer:

bnvc43

Step-by-step explanation:

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I'm not sure where to begin, can someone help me begin?
VLD [36.1K]
First, convert the mixed number into an improper fraction.
To convert a mixed number into an improper fraction, find the product of the whole number and the denominator and then add the numerator.
Then the denominator will be the original denominator from the mixed number.

1 \frac{1}{3} = \frac{4}{3}

Now the fraction \frac{4}{3} is being raised to the third power negative.
When an exponent is negative, it means to take the reciprocal of the number then raise it to the power of the absolute value of the exponent.

In a mathematical expression: x^{-n} = \frac{1}{x^n}

So, first take the reciprocal of \frac{1}{3} which is 3.

Then raise 3 to the absolute value of the exponent. The exponent is -3.
The absolute value of -3 is 3.

3^3 = 3 * 3 * 3 = 27

So, the answer is 27.
7 0
4 years ago
Ashley has sold 70% of the 20 candy bars she has to. How many candy bar's does she have left to sell
yawa3891 [41]
She has 6 left.
70%= 0.7
0.7 x 20 = how many she has sold (14)
OR
30%=0.3
0.3 x 20= how many she hasn't sold (6)


4 0
4 years ago
Read 2 more answers
ABCDEFGHI is a regular 9-sided polygon.
Igoryamba

Answer:

angle BEF = 100 degrees

Step-by-step explanation:

For a regular 9-sided polygon (nonagon),

each exterior angle = 360/9=40 degrees

each interior angle = 180-40 = 140 degrees.

Referring to diagram, in the trapezoid (trapezium) BCDE, the base angles are 180-140 = 40 degrees.

Therefore angle DEB = 40 degrees

that leaves BEF = 140-40 = 100 degrees

6 0
4 years ago
QUICKKK!!!!! PLEASEEEEEEEEEE
Valentin [98]

Answer:

10.29 (rounded = 10.30)

Step-by-step explanation:

X = a^2 + b^2 = c^2

X = 9^2 + 5^2 = c^2

X = (81) + (25) = c^2

X = 106 = c^2

X = √106 = c^2

X = 10.295630141 = c^2

X = 10.03 = c^2 (10.03 is 10.295630141 rounded to the nearest tenth)

5 0
3 years ago
Zev has 36 pencils and 45 erasers. He wants to use all of the pencils and erasers to make identical packages for his friends. Wh
soldier1979 [14.2K]

Answer:

Step-by-step

If you don't want to have anything left over, then the highest common factor is

36: 2 * 2 * 3 * 3

45: 3 * 3 * 5

The highest common factor is 9.

So he can make nine packages with

4 pencils in each one and

5 erasers in each package.

3 0
3 years ago
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