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amm1812
3 years ago
11

What is x? 3x+4y=70 and 8x-3y=9

Mathematics
1 answer:
love history [14]3 years ago
5 0
I am pretty sure x is 6
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Which inequalities are true? Check all that apply.
aev [14]

Answer: the correct answers are 1,2,3,5 hope this helps sorry if I’m wrong please don’t not be mad

Step-by-step explanation:

3 0
4 years ago
The height of a toy rocket that is shot in the air with an upward velocity of 48 feet per second can be modeled by the function
Irina18 [472]

Answer:

B) 36 ft

Step-by-step explanation:

Given:

The height as a function of time is given as:

f(t)=-16t^2+48t

At maximum height, the instantaneous velocity becomes 0. The instantaneous velocity is the first derivative of the height function.

So, the derivative of the the given function is 0 at the maximum height.

Differentiating the above function with time, we get

f'(t)=\frac{d}{dt}(-16t^2)+\frac{d}{dt}(48t)\\f'(t)=-32t+48

Now, equating the derivative to 0 and finding time.

f'(t)=0\\-32t+48=0\\32t=48\\t=\frac{48}{32}=1.5\ s

Therefore, time taken to reach maximum height is 1.5 s.

Now, maximum height is obtained by plugging in t=1.5 in the height equation.

Maximum height is given as:

h_{max}=-16(1.5)^2+48(1.5)\\h_{max}=-16\times 2.25+72\\h_{max}=-36+72\\h_{max}=36\ ft

4 0
3 years ago
Read 2 more answers
On a breezy day, Bonnie pedaled her human-powered aircraft 100 100 meters in 15 15 seconds going into the wind, and she made the
sladkih [1.3K]
Against the wind 100 m 15 sec = 6.67 mtrs / sec
With the wind 100 m 10 sec = 10 mtrs / sec
psa means plane velocity in still air
ws means wind speed
psa -ws = 6.67
psa + ws = 10

Adding both equations we get:
2 * psa = 16.67
psa = 8.34 meters per second
Since psa + ws = 10 and psa = 8.34 then wind speed = 1.66 meters per second






5 0
4 years ago
When 5 is added to a set of 3 numbers the mean increases to 4.6. What was the mean of the original 3 numbers?
SVEN [57.7K]
<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷  Multiply 4.6 by 4 to get the sum of the numbers after 5 was added:

4.6 x 4 = 18.4

^ This is the new total

Subtract 5 from this:

18.4 - 5 = 13.4

Divide this value by 3 to get the original mean:

13.4/3 = 67/15

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

7 0
4 years ago
Can someone please help me please?
scoray [572]
<h3>Answer: Choice D</h3>

Explanation:

For now, let's ignore the blue curve.

If we kept the red curve completely fixed in place, and only moved the xy axis, then we can move the xy axis 5 units to the right to give the illusion the red curve is moving (even though it's fixed in place).

Moving the xy axis 5 units to the right means each x input is 5 units larger. So x jumps up to x+5

In other words, going from f(x) to f(x+5) will shift the f(x) curve 5 units to the left. So that's why we go from x^2 to (x+5)^2 which is what choice D shows.

4 0
3 years ago
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