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sergey [27]
3 years ago
7

Combine like terms 2x - 3 - 2y - 4x + 2y + 5​

Mathematics
1 answer:
labwork [276]3 years ago
3 0

Answer:

-2x + 2

Step-by-step explanation:

2x - 3 - 2y - 4x + 2y + 5

2x - 4x + 2y - 2y + 5 - 3

-2x + 2

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Increase each of the following amounts by the percentage given.
umka21 [38]

Step-by-step explanation:

(a)90 by 10%

90+10% of 90=90(1+0.1)=99

(b)60 by 25%

60(1+0.25)=75

(c)80 by 75%

80(1+0.75)=140

(e)110 by 60%

110(1+0.6)=176

(f)480 by 115%

480(1+1.15)=1032

(g)140 by 45%

140(1+0.45)=203

6 0
3 years ago
The pulse rates of 174 randomly selected adult males vary from a low of 39 bpm to a high of 111 bpm. Find the minimum sample siz
Daniel [21]

Answer:

a. The sample size is approximately 97 adults

Step-by-step explanation:

The given parameters are;

The number of adults surveyed, n = 174

The lowest value of the pulse rate = 39 bpm

The highest value of the pulse rate = 111 bpm

The level of confidence used for determining the sample size = 90%

The given sample mean = 3 pm of the population mean

a. The range rule of thumb states that the standard deviation is approximately one quarter (1/4) of the range

The range = 111 bpm - 39 bpm = 72 bpm

Therefore, the standard deviation, σ = 72 bpm/4 = 18 bpm

The sample size, 'N', is given as follows;

N = \dfrac{z^2 \cdot p \cdot q}{e^2}

Where;

N = The sample size

z = The confidence level, 90% (z-score at 90% = 1.645)

p·q = σ² = 18² = 324

e² = 3² = 9

N = \dfrac{1.645^2  \times 324}{3^2} = 97.4169

Therefore the appropriate sample size, N ≈ 97 adults.

8 0
3 years ago
What is the volume of this cone? Use 3.14 for pi and round your answer to the
emmasim [6.3K]
So I use the formula hopefully these steps work

7 0
2 years ago
How to solve 4k-1.5k=50
padilas [110]
Combine like terms-- you can combine the k's:
4k-1.5k=2.5k

Now you have:
2.5k=50

Simply divide both sides by 2.5 to find the value of k:
\frac{2.5k}{2.5}=\frac{50}{2.5}\\\\k=20
6 0
3 years ago
7x + 2y = 24<br>8x + 2y = 30​
bagirrra123 [75]
(8x + 2y) - (7x + 2y) = 30 - 24

X = 6
5 0
3 years ago
Read 2 more answers
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