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d1i1m1o1n [39]
3 years ago
5

Please answer correctly !!!!!!!!! Will mark brainliest answer !!!!!!!!!!!!

Mathematics
1 answer:
dexar [7]3 years ago
3 0

Answer:

So it will take the stone 1 (one) second to reach its maximum height.

Step-by-step explanation:

Notice that the mathematical quadratic expression given is that of a parabola with branches pointing down. This means that the maximum value for that parabola is at the vertex. Your expression is also given in vertex form:

f(x)=a\,(x-x_v)^2+y_v

where the pair of coordinates (x_v,y_v) are the x coordinate of the vertex and the y coordinate of the vertex.

Since x in your case is the time the stone is on the air, then the maximum (vertex) is at the point (1, 45) where "1" is the time in seconds and 45 is the height of the stone in meters.

So it will take the stone 1 (one) second to reach its maximum height.

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(-4/9)(-5/8) multiply
Setler79 [48]
Multiply numerators:
-4*-5=20

Multiply denominators:
9*8=72

20/72= 10/36
10/36= 5/18

Final answer: 5/18
8 0
3 years ago
Read 2 more answers
A music store sold a total of 27 used trumpets and clarinets in one month. Trumpets cost $149 and clarinets cost $99. If total s
Annette [7]

Answer:

The number of clarinets musical store sold was 16. and number of trumpets musical store sold was 11.

Step-by-step explanation:

Let the musical store sells 'x' number of trumpets and 'y' number of clarinets.

According to question,

Total number of  trumpets and clarinets sold is 27 that is

x+y=27 ..............(1)

Also given Trumpets cost $149 and clarinets cost $99.

then the shop sold x trumpets for $149x and sold y clarinets for $99y and total sales were $3233.

thus, 149x+99y=3233  ...........(2)

Solving for equation (1) and (2),

Multiply equation (1) by 149 , we get

(1) ⇒ 149x+149y=4023  ........(3)

Now, subtract equation (3) from equation (2) , we get

149x+149y-(149x+99y)=4023-3233

\Rightarrow 149x+149y-149x-99y=790

\Rightarrow 149y-99y=790

\Rightarrow 50y =790

\Rightarrow y =\frac{790}{50}=15.8

Thus, number of clarinets musical store sold was 15.8 but since clarinets are to be in whole number rounding off to the nearest integer 16.

and put y = 16 in (1) , we get

x+y=27 \Rightarrow x+16=27 \Rightarrow x=27-16=11

Thus, number of trumpets musical store sold was 11.


4 0
2 years ago
Please help, it's due in less then 30 minutes :')​
iogann1982 [59]

Answer:

The answer is b. the range of Greta's graph is y<0

Step-by-step explanation:

7 0
2 years ago
The perfect squares between 22 and 50
ElenaW [278]

Answer:

25, 36, 49

Step-by-step explanation:

Start with a definition of perfect squares. Basically, they're the result of a number multiplied by itself. 2*2, or 2² = 4, which is a perfect square. 3*3, or 3² = 9, and so on. You can keep listing these until you get inside the interval you want (from 22 to 50).

4² = 16

5² = 25 ... so now we're where we want to be!

6² = 36 ... still good

7² = 49 ... that's lower than 50 still

8² = 64 ... and now we're over our limit, so 8 doesn't do the job for us.

The only perfect squares matching your criteria are 25, 36, and 49.

6 0
3 years ago
What is the solution?<br> Please show your work.<br> 4x+5y=70<br> 3x-2y=18
pishuonlain [190]

Answer:

(x,y)=(10,6)

Step-by-step explanation:

Substitute the value of x into the equation {4x+ 5= 70

                                                                       {x= 6+ 2/3y

solve the equation 4(6+2/3y) +5y = 70

substitute the value of y into the equation y=6

solve the equation x=6 + 2/3 times 6

A possible solution is x= 10

Check the solution (x,y) = (10 ,6)

Simplify {4 times 10 + 5 times 6 =7

              {3 times 10 - 2 times 6 = 18

The ordered pair is a solution {70 = 70

                                                   {18 =18

5 0
3 years ago
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