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3 years ago

Norris wrote the equation 7x9=63.Blake wrote the equation 7x9=9x7.Who wrote a correct equation?Explain

Mathematics

1 answer:

Karolina [17]3 years ago

7 0

Answer:

Step-by-step explanation:

They are both technically right 7 time 9 is 63 but 7 time 9 is equivalent to 9 times 7

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The first term of an arithmetic progression is 80 and the common difference is -3. what is the greatest possible sum of the firs

ikadub [295]

Answer:

S=157

Step-by-step explanation:

an= a1+(n-1)d

a2=80+(2-1)(-3)

a2=80-3

a2=77

Sn=(a1+an)*n/2

S2=(80+a2)*2/2

S2=(80+77)*1

S2=157

5 0

3 years ago

I don't really know what to do for this one.

Colt1911 [192]

Let, Price of a shirt = x
Price of a Jeans = y

Equations would be: 4x + 3y = 150
x + 2y = 70
x = 70-2y

Substitute it into first equation,
4(70-2y) + 3y = 150
280 - 8y + 3y = 150
-5y = -130
y = 130/5
y = 26

Substitute it into 2nd equation,
x + 2(26) = 70
x = 70-52
x = 18

So, Cost of a Shirt = $18 & Cost of a Jeans = $26

Hope this helps!

3 0

3 years ago

What is the length (magnitude) of the vector (7, -2)?

Sedbober [7]

Answer: B

Step-by-step explanation:

I just got it right on A P E X

have a good day

4 0

3 years ago

Read 2 more answers

Evaluate the iterated integral. $$ \int\limits_0^{2\pi}\int\limits_0^y\int\limits_0^x {\color{red}9} \cos(x+y+z)\,dz\,dx\,dy $$

KengaRu [80]

$\displaystyle\int_{y=0}^{y=2\pi}\int_{x=0}^{x=y}\int_{z=0}^{z=x}\cos(x+y+z)\,\mathrm dz\,\mathrm dx\,\mathrm dy=\int_{y=0}^{y=2\pi}\int_{x=0}^{x=y}\sin(x+y+z)\bigg|_{z=0}^{z=x}\,\mathrm dx\,\mathrm dy$
$\displaystyle=\int_{y=0}^{y=2\pi}\int_{x=0}^{x=y}\sin(2x+y)-\sin(x+y)\,\mathrm dx\,\mathrm dy$
$\displaystyle=\int_{y=0}^{y=2\pi}-\frac12\left(\cos(2x+y)-2\cos(x+y)\right)\bigg|_{x=0}^{x=y}\,\mathrm dx\,\mathrm dy$
$\displaystyle=\int_{y=0}^{y=2\pi}-\frac12\left((\cos3y-2\cos2y)-(\cos y-2\cos y)\right)\bigg|_{x=0}^{x=y}\,\mathrm dy$
$\displaystyle=-\frac12\int_{y=0}^{y=2\pi}(\cos3y-2\cos2y+\cos y)\,\mathrm dy$
$\displaystyle=-\frac12\left(\frac13\sin3y-\sin2y+\sin y\right)\bigg|_{y=0}^{y=2\pi}$
$=0$

4 0

3 years ago

An Environmental Club collected 100 pounds of aluminum cans to recycle. 1 point

MissTica

Answer:

well, there are 52 weeks in a year, so if you just multiply the pounds of cans by the amount of years, you get 1,300

Step-by-step explanation:

*sigh*

4 0

3 years ago