Regras dos sinais e números racionais resuma

Mathematics

1 answer:

anygoal [31]3 years ago

7 0

Answer:

Regras: - Ao adicionar dois inteiros positivos, você receberá uma soma positiva. ... -Ao adicionar um inteiro que seja negativo e um que seja positivo, a soma dependerá de quão grande é o valor absoluto para os dois inteiros para saber se a resposta será positiva ou negativa.

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Read 2 more answers

A grapefruit has a peel that is 1cm thick and a total diameter of 12cm. What percentage of volume of the grapefruit is the peel?

ira [324]

Answer:

0.3056 or 30.56%

Step-by-step explanation:

The volume of the grapefruit with the peel is:

$V_p=\frac{4 \pi (d/2)^2}{3}\\V_p=\frac{4 \pi (12/2)^2}{3}\\V_p=48 \pi$

When removing the peel, the grapefruit diameter becomes 10 cm (take out 1 cm of peel from each side). The volume of the grapefruit without the peel is:

$V_n=\frac{4 \pi (d/2)^2}{3}\\V_n=\frac{4 \pi (10/2)^2}{3}\\V_n=33.333 \pi$