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larisa86 [58]
3 years ago
9

28% of what number is 63

Mathematics
2 answers:
Alona [7]3 years ago
7 0
28/100= x/63 
 
28*63=1764.
100*x=100x
 We divide 100 both sides. 
 What will be the Answer?


Scrat [10]3 years ago
6 0
We set up a proportion: 63/?= 28/100

Cross multiply: 28*?= 63*100
⇒ ?= 63*100/28= 225

28% of 225 is 63.
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7/2x+1/2x = 18+ 9/2x
chubhunter [2.5K]

Answer:

x=-36

Step-by-step explanation:

Add the 7/2x +1/2x to be 8/2x which means that it'll be 4x=18=9/2

then subtract 9/2x on both sides so itll be

4x=18+\frac{9}{2} x

-9/2x       -9/2x

-\frac{1}{2} x=18   because if you do 8/2-9/2 it's -1/2

then multiply the reciprocal to both sides so

(\frac{2}{-1})(-\frac{1}{2}x)=(\frac{2}{-1})(18)

which then cancels out -1/2 and makes it

x=-36

4 0
3 years ago
I need help on this please!!
marin [14]

Answer:

In fifteen years, Alexis would have 9200. In twenty years she would have 9600

Step-by-step explanation:

10% for interest of 8000= 80.

80 (interest for one year) * 15 (fifteen years)= 1200

1200 plus the original amount is 9200.

80 (interest for one year) * 20 ( twenty years)= 1600

1600 plus the original amount is 9600

6 0
3 years ago
A random sample of 11 university students produced the following data, where x is the minutes spent studying per day, and y is t
SIZIF [17.4K]

Answer:

16.373,16.4

Step-by-step explanation:

Given that a  random sample of 11 university students produced the following data, where x is the minutes spent studying per day, and y is the first exam score (out of a maximum of 100 points).

x y

11 39

13 55

14 43

17 46

19 69

22 75

24 77

25 78

28 77

31 93

34 92 Observations 11        

       

ANOVA        

df SS MS F Significance F    

Regression 1 3214.095153 3214.095153 69.46052448 1.59367E-05    

Residual 9 416.4503017 46.27225574      

Total 10 3630.545455      

       

Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper 95.0%

Intercept 16.37281677 6.48384963 2.525169105 0.0324919 1.705329914 31.04030362 1.705329914 31.04030362

x 2.369323595 0.28428592 8.33429808 1.59367E-05 1.726224167 3.012423023 1.726224167 3.012423023

We get regression line as y =2.369x+16.373

a) value of intercept = 16.373

b) 16.4

8 0
3 years ago
I don't understand what this means.
Alina [70]

Answer:

a) -3x^3 - 2x + y - 10 = 0

b) it a trinomial

c) not sure. sorry. :(

hope this helps.:)

5 0
3 years ago
Find the greatest common factor of the following monomials : 10b^5 , 26b^6
charle [14.2K]

Answer:

2b^5.

Step-by-step explanation:

The Greatest Common Factor of 10 and 26 is 2.

The GCF of b^5 and b^6 is 5^5.

Answer is 2b^5.

4 0
3 years ago
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