I need help with 7. And 9.

Mathematics

1 answer:

storchak [24]4 years ago

7 0

Number 7 would be 9.7536 or rounding to the nearest tenth 9.8
Number 9 would be 18,700.8

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HELP ME PLEASE I NEED YOU

Leokris [45]

Answer:

Step-by-step explanation:

to find this with your calculator

$\left[\begin{array}{ccc}5&-5&2\\1&5&-6\\1&4&-5\end{array}\right] ^{-1} \left[\begin{array}{ccc}21\\24\\21\end{array}\right]$

it will give you [5 -1 -4]

4 0

3 years ago

Which function has (2,8) on its graph

Sedbober [7]

Answer:

y = 2x^2

Step-by-step explanation:

The the coordinates (2,8) are expressed in terms of (x,y). Substitute the x with 2 and y with 8 and plug them into the formulas. The one that has the two sides equal to each other is the function that has (2,8) on its line.

7 0

3 years ago

Solve the simultaneous equations:<br> 5x+3y=12<br> 2x+y=5

goblinko [34]

<span>5x+3y=12
2x+y=5

Change the second equation to y=-2x+5. Now substitute this into the first equation:

5x+3(-2x+5)=12
5x-6x+15=12
-x+15=12
-x=-3
x=3

Now you can find y.
y=-2x+5
y=-2(3)+5
y=-1</span>

8 0

4 years ago

Read 2 more answers

Someone please help need ASAP

alisha [4.7K]

The slope intercept form is given by
$y = mx + c$
where m is the slope and c is the y - intercept

That is
$m = \frac{3}{5}$
$c = 7$
Hence the equation is
$y = \frac{3}{5} x + 7$

7 0

3 years ago

What is the explicit formula for this sequence? −8, −3, 2, 7, …

hjlf

It's an arithmetical sequence with $a_1=-8,d=5$

$a_n=a_1+(n-1)d\\\\a_n=-8+(n-1)\cdot5\\\\a_n=-8+5n-5\\\\\boxed{a_n=5n-13}$

3 0

3 years ago