Question
Add the following rational number:
$\frac{3}{4}$ and $\frac{-3}{5}$
$\frac{3}{4}$ and $\frac{-3}{5}$
✓
Answer
$\frac{3}{20}$
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Science Application:
An atom consists of charged particles called electrons and protons. Each proton has a charge of $+1$ and each electron has a charge of $-1.$ Remember number of electrons is equal to number of protons, while answering these questions:
What will be the charge on an atom if it gains an electron$?$
→An atom consists of charged particles called electrons and protons. Each proton has a charge of $+1$ and each electron has a charge of $-1.$ Remember number of electrons is equal to number of protons, while answering these questions:
What will be the charge on an atom if it gains an electron$?$
The rainfall (in mm) in a city on 7 days of a certain week was recorded as follows:
(i) Find the range of the rainfall from the above data.
(ii) Find the mean rainfall for the week.
(iii) On how many days was the rainfall less than the mean rainfall?
| Day | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
| Rainfall (in mm) | 0.0 | 12.2 | 2.1 | 0.0 | 20.5 | 5.3 | 1.0 |
(ii) Find the mean rainfall for the week.
(iii) On how many days was the rainfall less than the mean rainfall?
What should be subtracted from $\left(\frac{3}{4}-\frac{2}{3}\right)$ to get $\frac{-1}{6}$ ?
→In Fig. line $A C \|$ line $D E$ and $\angle A B D=32^{\circ}$. Find out the angles $x$ and $y$, if $\angle E=122^{\circ}$.
→In a furniture shop, $24$ tables were bought at the rate of $Rs. 450$ per table. The shopkeeper sold $16$ of them at the rate of $Rs. 600$ per table and the remaining at the rate of $400$ per table. Find her gain or loss per cent.
→ Solve: $0.5\text{x}+\frac{\text{x}}{3}=0.25\text{x}+7$
→Find the difference: $7-4\frac{2}{3}=\frac{7}{1}-\frac{14}{3}$
→Simplify the following and express a rational number:
$\Bigg\{\Big(\frac{-3}{4}\Big)^3-\Big(\frac{-5}{2}\Big)^3\Bigg\}\times4^2$
→$\Bigg\{\Big(\frac{-3}{4}\Big)^3-\Big(\frac{-5}{2}\Big)^3\Bigg\}\times4^2$
Subtract:
$-x^2-3 z$ from $5 x^2-y+z+7$
→$-x^2-3 z$ from $5 x^2-y+z+7$