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3 years ago

Simply 8 divided 2(10 -r )

Mathematics

1 answer:

stepladder [879]3 years ago

6 0

Answer:

$\frac{4}{10-r}$

Step-by-step explanation:

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Please help with this Circle Geometry question??

user100 [1]

(i) XYZ = 180 - 64
= 116 degrees
Opposite angles in a cyclic quadrilateral add up to 180 degrees

(ii) YXZ = 23 degrees
Alternate angles in a segment are the same

(iii) OXZ = 26
XOZ = 64 x 2
= 128 degrees
The the angle at the centre is double the angle at the circumference.
180 - 128 = 52
OXZ = 52/2
= 26
Triangle OZX is an isosceles triangle

(Don't forget to include the reasons above full marks)

3 0

3 years ago

If sales tax is 6% and you buy a shirt for $25 how much do you owe?

Leona [35]

Answer:

26.50

Step-by-step explanation:

First we need to calculate the sales tax

25 * 6%

Changing to decimal from

25 * .06

1.50

Then we add the tax to the cost of the shirt

25+1.50

26.50

We owe 26.50

7 0

3 years ago

I keep getting confused I don't understand what I keep doing wrong

rosijanka [135]

$\bf \begin{cases}
5x+3y+z=-14\\
2x-2y-z=-13\\
3x+y+3z=-2
\end{cases}$

so.. let's us eliminate, say "z" first, so for that, let's pick the 1s and 2nd equations there $\bf \begin{array}{llll}
5x+3y+z=-14\\
2x-2y-z=-13\\
----------\\
\boxed{7x+y+0\ =-27}
\end{array}$

so, that's our first two-variables resultant

let's pick other two, and again, eliminate the same "z" variable, this time, let's use the 2nd and 3rd equations $\bf \begin{array}{llll}
2x-2y-z=-13&\times 3\implies &6x-6y-3z=-39\\
3x+y+3z=-2\implies &&3x+y+3z\ =-2\\
&&----------\\
&&\boxed{9x-5y+0\ =-41}
\end{array}$

now, we have two two-variables equations, let's use them then
and say, we'll eliminate the "y" variable from them

$\bf \begin{array}{llll}
7x+y=-27& \times 5\implies &35x+5y=-135\\
9x-5y=-41\implies &&9x-5y=-41\\
&&-------\\
&&44x+0=-176
\end{array}
\\\\\\
x=\cfrac{-176}{44}\implies \boxed{x=-4}
\\\\\\
\textit{now, that we know x = -4, let's plug that in }7x+y=-27
\\\\\\
7(-4)+y=-27\implies y=-27+28\implies \boxed{y=1}$

$\bf \textit{now, let's plug those two at }5x+3y+z=-14
\\\\\\
5(-4)+3(1)+z=-14\implies -20+3+z=-14\implies z=-14+17
\\\\\\
\boxed{z=3}$

7 0

3 years ago

Decide if the following equation is growth or decay?

rewona [7]

Answer:

decay im pretty sure

Step-by-step explanation:

8 0

3 years ago

What is the equation of the line that is perpendicular to Y= -2/3X+4 and that passes through (-2,-2)?

ratelena [41]

Answer:

$y = \frac{3}{2}x + 1$

Step-by-step explanation:

-2 = 1½[-2] + b

-3

1 = b

y = 1½x + 1

** 1½ = 3⁄2

Perpendicular Lines have OPPOSITE MULTIPLICATIVE INVERSE RATE OF CHANGES [SLOPES]:

-⅔ → 1½

I am joyous to assist you anytime.

3 0

3 years ago

Read 2 more answers