3 years ago

X ( x + 4 ) − 3 = 4 ( x + 19.5 )

Mathematics

1 answer:

Studentka2010 [4]3 years ago

7 0

Answer:

Step-by-step explanation:

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Plz help me, can't figure this out:

Bess [88]

Answer:

y= -2/5x - 6

Step-by-step explanation:

Use Rise/Run with any of the given points! You go up two, left 5. That proves the slope is -2/5. The line hits the Y axis at -6, so the y-intercept is -6!

I hope this helps!!

3 0

3 years ago

Yall are doing great thanks sm for the help

blondinia [14]

Answer:

That is an obtuse isosceles

4 0

3 years ago

If ab= 53 and ac= 81, find bc

Snowcat [4.5K]

If you know the total length, and the length of one part, and you're trying to find the other part, just subtract.

81-53=28

bc=28

8 0

3 years ago

Find n for the sequence for which a1 = 30, d = -4 and sn= -210.

REY [17]

$n\in\mathbb{N^+}$

The formula of the sum of an arithmetic sequence:

$S_n=\dfrac{2a_1+(n-1)d}{2}\cdot n$

We have:

$a_1=30;\ d=-4;\ S_n=-210$

substitute:

$\dfrac{2\cdot30+(n-1)(-4)}{2}\cdot n=-210\ \ \ |\cdot2\\\\(60-4n+4)n=-420\\\\(64-4n)n=-420\\\\64n-4n^2=-420\ \ \ |:(-4)\\\\n^2-16n=105\ \ \ |-105\\\\n^2-16n-105=0\\\\n^2+5n-21n-105=0\\\\n(n+5)-21(n+5)=0\\\\(n+5)(n-21)+0\iff n+5=0\ \vee\ n-21=0\\\\n=-5\notin\mathbb{N^+}\ \vee\ n=21\in\mathbb{N^+}$

Answer: b. 21

3 0

4 years ago

Read 2 more answers

I need help I don't understand this at all.

Mama L [17]

please mark this answer as brainlist

6 0

3 years ago