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laiz [17]
3 years ago
14

The ratio of boys to girls in a class is 4:5

Mathematics
2 answers:
mestny [16]3 years ago
6 0

Answer:

4/9 5/9

Step-by-step explanation:

Dimas [21]3 years ago
5 0

Answer:

Boys = 4/9

Girls = 5/9

Step-by-step explanation:

You add the ratio parts to find what the fraction is over.

5 + 4 = 9

Then you just need to know which part is boys and which is girls.

Boys to Girls = 4:5

Therefore Boys = 4/9 and Girls = 5/9.

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A man spends 2/5 of his salary on food, 3/10 on his rent and 1/8 on other expenses. What fraction of his salary is still left wi
tino4ka555 [31]

Answer:

\frac{7}{40}

Step-by-step explanation:

1-(\frac{2}{5}+\frac{3}{10}+\frac{1}{8})

1-\frac{33}{40}

\frac{7}{40}=0.175

6 0
3 years ago
Read 2 more answers
Simplify (-4 + 5i) + 2(1 + 3i). Enter your answer in the form a + bi.
luda_lava [24]

(-4 + 5i) + 2(1 + 3i)

  • Distribute 2 inside the parentheses.

(-4 + 5i) + 2 + 6i

  • Combine like terms.
<h3>-2 + 11i</h3>
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5 0
3 years ago
after allowing 20 percent discount on the marked price of a radio 15 percent vat is levied on it , if its price become rs 22080
Kamila [148]

Answer:

Step-by-step explanation:

Hello, let's say that the price was P, a real number.

After 20% discount it become P - 20% * P = P* (1-20%) = P * (1 - 0.2)

= P * 0.8

And then we take 15% for the VAT, the new price become P * 0.8 * ( 1 + 15%)

= P * 0.8 * 1.15

And this is equal to 22080, so

P * 0.8 * 1.15 = 22080

and the amount of the VAT is P *0.8 * 0.15

=\dfrac{22080}{1.15}*0.15=2880

Hope this helps.

Thank you.

5 0
3 years ago
(x-5)^2+2=11 solve by using square roots.
JulijaS [17]
<h3>Answer:  x = 2 or x = 8</h3>

Work Shown:

(x-5)^2+2=11\\\\(x-5)^2=11-2\\\\(x-5)^2=9\\\\x-5=\pm\sqrt{9}\\\\x-5=\pm3\\\\x=5\pm3\\\\x=5+3 \text{ or } x = 5-3\\\\x=8 \text{ or } x = 2\\\\

8 0
2 years ago
Is (ab)² equivalent to ab², why or why not?
Montano1993 [528]

(ab)² and ab² are not equal. When you have something in parentheses being squared, you have to square everything inside, so in the case of (ab)², you have to "distribute" the ² to both variables inside. That gives you a²b², not just ab².

If the abstract way is kind of confusing for you, just pick two random numbers for a and b and plug them in to test it. Say a = 3 and b = 4. Then

(3*4)² = 3*4²

(12)² =  3*16

144 ≠ 48

6 0
3 years ago
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