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3 years ago

Help. this is my daughter's math. how does it work?

Mathematics

1 answer:

WARRIOR [948]3 years ago

3 0

Answer:

An ion with a -2 charge, atomic number 17, an atomic mass of 25 has how many electrons?

Step-by-step explanation:

Help me

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If a number is odd, then it has a remainder of 1 when divided by 2.

kherson [118]

Answer:

The hypothesis of the conditional is "A number is odd".

Step-by-step explanation:

The statement can be represented by the following proposition:

$P \implies Q$ (Eq. 1)

Where:

$P$ is the hypothesis of the proposition.

$Q$ is the conclusion of the proposition.

$\implies$ - Binary connector, which means "If...., then...."

In this case, we present what each propostion represents:

P = A number is odd.

Q = It has a remainder of 1 when divided by 2.

In consequence, the hypothesis of the conditional is "A number is odd".

6 0

4 years ago

Evaluate the expression when n=9. n2-14

Semenov [28]

Answer:

Step-by-step explanation:

9×2-14(n=9)
18-14
4 is answer

5 0

3 years ago

Find the number of terms in this polynomial. -5h + 8

Arisa [49]

Hi! I can help you with joy! :)

Let's find the number of terms in this polynomial.
The given polynomial has 2 terms:
-5h and 8
Polynomials with 2 terms are called "binomials"
Thus, -5h+8 has 2 terms.

Answer:

2 terms

Hope it helps!

$\rm{Stargazing{\bold{WithJoy:D}$

4 0

3 years ago

A minibus sets off at 7.30 am and arrives

olga_2 [115]

Answer:

4 hours and 15 minutes

Step-by-step explanation:

3 0

3 years ago

Geometry . Cosines / sines. Find a and round to the nearest 10th

Lorico [155]

This is the good part of Trigonometry, actually measuring triangles. It's much better than all the identities around sine and cosine and the rest, which actually have more to do with circles than triangles.

This part of trig has a short menu:

Law of Cosines. Three ways to write it, one is $c^2 =a^2+b^2-2ab \cos C$

Law of Sines: $\dfrac{a}{\sin A} = \dfrac{b}{\sin B} = \dfrac{c}{\sin C}$

Triangle angles: $A+B+C=180^\circ$

and two special cases of the Law of Cosines, the Pythagorean Theorem

$C=90^\circ, \quad \quad c^2=a^2+b^2$

and the Collinear Points Theorem:

$C=180^\circ, \quad \quad c^2=a^2+b^2 - 2 a b \cos 180^\circ = a^2+b^2+2ab=(a+b)^2$

$c = a+b$

Here we choose Triangle Angles followed by Law of Sines:

A = 180 - 105 -15 = 60 degrees

$\dfrac{a}{\sin 60^\circ}= \dfrac{2}{\sin 105^\circ}$

$a= \dfrac{2 \sin 60^\circ}{\sin 105^\circ} = 1.793...$

Answer: 1.8 cm

When I was a student we'd be expected to get $\sin 105^\circ$ exactly and get

$a = 3 \sqrt{2} - \sqrt 6$

But that was before online homework.

5 0

3 years ago

Help. this is my daughter's math. how does it work? ​

Help. this is my daughter's math. how does it work?