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3 years ago

PLZ HELP DONT UNDERSTAND!!!

Mathematics

1 answer:

victus00 [196]3 years ago

7 0

$\bf \textit{area of a triangle}=A=\cfrac{1}{2}bh\qquad 
\begin{cases}
b=base\\
h=\textit{height or altitude}
\end{cases}\\\\
-----------------------------\\\\
\textit{area of a trapezoid}\\\\
A=\cfrac{h}{2}(a+b)\qquad 
\begin{cases}
a=\textit{base, or one of the parallel sides}\\
b=\textit{base, or the other parallel side}\\
h=\textit{height, the distance between both}\\
\qquad \textit{parallel sides}
\end{cases}$

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The variable z is directly proportional to x, and inversely proportional to y. When x is 4 and y is 13, z has the value 1.230769

Talja [164]

Answer:

Step-by-step explanation:

1.2307692307692.

The first step is to find the proportionality constant.

The formula is

z = kx/y

1.2307692307692 = k * 4/13 Multiply both sides by 13

1.2307692307692 * 13 = 4k

16 = 4*k Divide by 4

k = 16/4

k = 4

=================================

z = k*x/y

x = 9

y = 20

k = 4

z = 4 *9/20

z = 36/20

z = 1.8

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3 years ago

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I’m having trouble with this. There should be an image or a link attached.

alina1380 [7]

Answer:

1.) n-10

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3.) -8n+1

4.) 1/2 - 19 ( dont trust me on this)

5.)3/5-21 or 3/5>21

6.)x^+15

Step-by-step explanation:

I tried double check it

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2 years ago

6 and<br> Find the value of this expression if x<br> y--1.<br> xy2<br> -5

zysi [14]

Answer:

y = 5; x = 1/5

Step-by-step explanation:

xy = 1 -----> x = 1/y

xy^2 = 5 -----> 1/y * y^2 = 5

y^2 / y = 5

y = 5

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x = 1/5

Hope this Helps!

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3 years ago

If 9 is p present of 17 then p is a number between

Pepsi [2]

Answer:

40% and 60%

╰(*°▽°*)╯

Step-by-step explanation:

60% of 17 is 10.2 making 40% and 60% the closest choice to 9

So, the answer would be 40% and 60%

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3 years ago

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Two beach rental companies compared their sales from last weekend. Both companies rent out jet skis and kayaks, and they charge

nignag [31]

Answer:

To rent a jet ski you need to pay $50 and to rent a kayak you need to pay $20

Step-by-step explanation:

Since both shops charge the same amount for each kind of vehicle, we will assign variables to the their cost. The cost of a jet ski will be "x" and the cost of the kayak will be "y". Therefore we can create a system of equations as shown below:

Will's shop:

12*x + 9*y = 780

Fun Rentals:

7*x + 11*y = 570

$\left \{ {{12x+ 9y=780} \atop {7x + 11y =570}} \right.\\$

We can isolate "x" on the second equation, we have:

$x = \frac{570 - 11y}{7}$

Applying this value on the first equation:

$12[\frac{570 - 11y}{7}] + 9y = 780\\\frac{6840 - 132y}{7} + 9y = 780\\\frac{6840 - 132y + 63y}{7} = 780\\ 6840 - 132y + 63y = 5460\\6840 - 69y = 5460\\69y = 1380\\y = 20$

Applying the value of "y" we found on the "x" equation above, we have: $x = \frac{570 - 11*20}{7}\\x = 50\\$

Therefore to rent a jet ski you need to pay $50 and to rent a kayak you need to pay $20

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3 years ago