(please help!) Add −1.25+2.5 Plot the first addend and the sum on the number.

Mathematics

2 answers:

AVprozaik [17]3 years ago

3 0

Answer:

the answer of this question is 1.25

jenyasd209 [6]3 years ago

3 0

-1.25+2.5 = 1.25.
___

You might be interested in

Combine like terms for 18p + 89 + 2p - 79

N76 [4]

$\huge\underline{\boxed{Hi\;there!}}}$

Like terms are "from the same family"

In the given expression, 18p and 2p are like terms.

Let's add them:

18p+2p-79+89

20p+10

$\huge\boxed{\mathfrak{Answer:{\boxed{\boxed{20p+10}}}}}$

$\bigstar$ I really hope it helps you!

$\rm{Have\;a\;splendiferous\;day!$

$\bold{FabulousKingdom}$

6 0

3 years ago

Read 2 more answers

If u+v+w=0, show that u x v = v x w = w x u

nydimaria [60]

$\mathbf u+\mathbf v+\mathbf w=\mathbf 0$

Take the cross product of both sides with $\mathbf u,\mathbf v,\mathbf w$ , respectively. By the distributive property of the cross product, you have the system

$\begin{cases}\mathbf u\times\mathbf u+\mathbf u\times\mathbf v+\mathbf u\times\mathbf w=\mathbf 0\\\mathbf v\times\mathbf u+\mathbf v\times\mathbf v+\mathbf v\times\mathbf w=\mathbf 0\\\mathbf w\times\mathbf u+\mathbf w\times\mathbf v+\mathbf w\times\mathbf w=\mathbf 0\end{cases}\iff\begin{cases}\mathbf u\times\mathbf v+\mathbf u\times\mathbf w=\mathbf 0\\\mathbf v\times\mathbf u+\mathbf v\times\mathbf w=\mathbf0\\\mathbf w\times\mathbf u+\mathbf w\times\mathbf v=\mathbf 0\end{cases}$

since $\mathbf x\times\mathbf x=\mathbf0$ for any vector $\mathbf x$ .

And because the cross product is anticommutative, you have

$\begin{cases}\mathbf u\times\mathbf v-\mathbf w\times\mathbf u=\mathbf 0\\-\mathbf u\times\mathbf v+\mathbf v\times\mathbf w=\mathbf0\\\mathbf w\times\mathbf u-\mathbf v\times\mathbf w=\mathbf 0\end{cases}$

from which it follows immediately that

$\mathbf u\time\mathbf v=\mathbf v\times\mathbf w=\mathbf w\times\mathbf u$