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IgorLugansk [536]
3 years ago
13

In a class of 25 students

Mathematics
1 answer:
Rudik [331]3 years ago
4 0
If the mean height of 15 girls is 1.65m, the sum of the girls’ heights is 15×1.65=24.75m.

If the mean height of 10 boys is x metres, the sum of the boys’ heights is 10x m.

The sum of all 25 srudents’ heights is 25×1.682=42.05m.

Therefore, 24.75+10x=42.05, x=(42.05-24.75)/10=1.73m, the mean height of the boys.
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The best way to achieve significant increases in interest after all in a savings account is through?
Alekssandra [29.7K]

Answer: The answer is (d) Compounding.

Step-by-step explanation:  We are given four options out of we are to select the best way through which we can achieve significant increases in interest after all in a savings account.

Increases in principle and increases in time will not give the result, because we are talking about a fixed amount of money for a fixed time.

Also, increases in interest is not in our hand.

So, only we can do is compounding. Here, in same amount of money and time, the rate of interest will automatically increase.

Thus, the correct option is (d) Compounding.

4 0
3 years ago
The digit in the tens place of a two digit number is three times that in the units place. If the digits are reversed the new num
S_A_V [24]
We could do it with algebra.  But we can also do it the long way, which is
shorter than the algebraic way.

The digit in the tens place is 3 times the digit in the units place.
So the number MUST be
31, or
62, or
93 .
It can't be anything else.

Now here they are again, with the reverse of each one:

31 . . . 13      The new number is  18 less.
62 . . . 26      The new number is  36 less.
93 . . . 39      The new number is  54 less.

Obviously, the original number is 62.
 
4 0
3 years ago
Which is the slope of the line that passes through the points (2,10) and (5,8)?
german
It is -3/2, 2/10 - 5/8 = -3/2
6 0
3 years ago
What is the value of x if e^3x+6=8
Ber [7]

e^{3x+6}=8\to\ln e^{3x+6}=\ln8\iff3x+6=\ln8\qquad|-6\\\\3x=\ln8-6\qquad|:3\\\\\boxed{x=\dfrac{\ln8-6}{3}}\\\\\text{used:}\\\\\log_aa^n=n

5 0
3 years ago
Read 2 more answers
What is the answer X/7-3>8
mamaluj [8]

Answer:

x > 77

Step-by-step explanation:

According to order of operations rules, we must carry out division before addition or subtraction.  In this case we wish to isolate x and are permitted to simplify the inequality by combining the "like terms" 3 and 8, as follows:

X/7-3>8

     +3 +3

--------------

x/7 > 11

The easiest way in which to solve for x is to multiply both sides of this inequality by 7:

7(x/7) > 7(11), or

x > 77

All numbers greater than 77 are part of the solution set.

4 0
3 years ago
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