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r-ruslan [8.4K]
2 years ago
10

If a class of 30 students have to split the boys and girls in hafe and 10% are girls, how meany girls are in the class

Mathematics
1 answer:
Anit [1.1K]2 years ago
6 0

Answer:

10 girls

Step-by-step explanation:

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Can anyone walk me through this?
Fiesta28 [93]

Assuming that we are solving in terms of n.


Start by distributing:

2(n + 5)

(2*n) + (5*2)

2n + 10 = -2


Subtract 10 to start toward isolating your variable:

2n = -12


Divide by two to finish solving:

n = -6

6 0
3 years ago
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Using 5 letters followed by 2 ​digits, how many passwords are​ possible?
Deffense [45]
Since there is no condition whatsoever for this arrangement, I can consider the 2 digits and the 5 letters as 7 different objects.

Total permutation (with no repetition):
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Total permutation (WITH REPERTITION):

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6 0
2 years ago
Type the correct answer in the box use/ for the fraction bar
Zarrin [17]

Answer:

see explanation

Step-by-step explanation:

given the 2 equations

y = x² - 2x - 19 → (1)

y + 4x = 5 → (2)

substitute y = x² - 2x - 19 into (2)

x² - 2x - 19 + 4x = 5 ( subtract 5 from both sides )

x² + 2x - 24 = 0 ← in standard form

(x + 6)(x - 4) = 0 ← in factored form

equate each factor to zero and solve for x

x + 6 = 0 ⇒ x = - 6

x - 4 = 0 ⇒ x = 4

substitute each value of x into (1) for corresponding y- coordinate

x = - 6 : y = (- 6)² - 2(- 6) - 19 = 36 + 12 - 19 = 29 ⇒ (- 6, 29)

x = 4 : y = 4² - 2(4) - 19 = 16 - 8 - 19 = - 11 ⇒ (4, - 11)

the solutions are (- 6, 29), (4, - 11)


6 0
2 years ago
A box of granola bars has 26 bars. If 7 friends split the bars equally, how many bars will be left?
Vinvika [58]

It will be 5 because 7x3 is 21, minus 26 to 21 is 5, won't be 7x4=28 and that's greater than 26

6 0
3 years ago
On a bike trip across the US, Rodney notes that he covers about 190 miles every 4 days. If he continues at this rate, use a rati
Sindrei [870]
The answer is 285 miles for 6 days
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2 years ago
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