3 years ago

Simplify 7.5/4 - 4.9+2.1/25

Mathematics

1 answer:

andriy [413]3 years ago

6 0

Answer:

-2.941

Step-by-step explanation:

7.5/4=1.875

2.1/25=0.084

1.875-4.9+0.084

-3.025+0.084

-2.941

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Select the three ratios that are equivalent to 3 boys/5 girls.

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$\dfrac{3\ boys}{5\ girls}\to\dfrac{3}{5}\\\\\dfrac{8}{10}=\dfrac{8:2}{10:2}=\dfrac{4}{5}\\\\\dfrac{15}{25}=\dfrac{15:5}{20:5}=\dfrac{3}{5}\\\\\dfrac{9}{15}=\dfrac{9:3}{15:3}=\dfrac{3}{5}\\\\\dfrac{30}{50}=\dfrac{30:10}{50:10}=\dfrac{3}{5}\\\\Answer:\\\\\boxed{\dfrac{3\ boys}{5\ girls}=\dfrac{15\ boys}{25\ girls}=\dfrac{9\ boys}{15\ girls}=\dfrac{30\ boys}{50\ girls}}$