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astraxan [27]
4 years ago
11

Please help here!!!!!!!!!!!!!!!!!

Mathematics
1 answer:
fomenos4 years ago
7 0
The equation represents height above the ground. we want to know time it takes to hit the ground, so make the equation (height) equal to zero and solve for t.


0 =  - 16{t}^{2}   + 120 \\  \\  - 120 =  - 16 {t}^{2}   \\  \\ 7.5 =   {t}^{2}   \\  \\ t = 2.7 \: seconds
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John sold a car for 60,000 dollars and made a profit of 20%.what is the cost price of the car​
zhannawk [14.2K]

Answer:

72,000

Step-by-step explanation:

20% of 60,000 = 12,000

60,000 + 12,000 = 72,000

Chow,...!

7 0
3 years ago
Use the figure below to find AC<br><br> A. 16<br><br> B. 20<br><br> C. 40<br><br> D. 50
Murrr4er [49]
16...................................
5 0
4 years ago
Show that 551 is a rational by writing it in the form a/b, where a and b are integers
igor_vitrenko [27]

Answer:

  551/1

Step-by-step explanation:

  551 = \dfrac{551}{1}

__

Any integer can be written as a rational number with a denominator of 1.

3 0
3 years ago
Help 7th grade math pls
madam [21]

Answer:

1,455 feet

Step-by-step explanation:

Step 1:

1 : 75    Ratio Inches to Feet

Step 2:

1 : 75 = 19.4 : x   Equation

Answer:

x = 1,455  Multiply

Hope This Helps :)

4 0
3 years ago
Read 2 more answers
ΔABC is a right triangle. Prove: a2 + b2 = c2 Right triangle BCA with sides of length a, b, and c. Perpendicular CD forms right
777dan777 [17]

Answer: Pythagorean Theorem Pieces of Right Triangles is not a justification for the proof.

Explanation : Here, \triangle ABC is a right triangle with sides a, b and c. Perpendicular CD forms right triangles BDC and CDA.

CD measures h units, BD measures y units, DA measures x units.

Draw an altitude from point C to Line segment AB Let segment BC = a segment CA = b, segment AB = c,  segment CD = h,  segment DB = y, segment AD = x,

y + x = c

a/c=y/a( Similarity theorem in triangles ABC and DBC )

a^2 = cy------(1) (Cross Product Property)

Similarly, b^2 = cx (Similarity theorem in triangles ABC and ADC)---------(2)

a^2 + b^2 = cy + cx(after adding equation (1) and (2) )

a^2 + b^2 = c(y + x)( By additional property of equality)

a^2 + b^2 = c^2. ( because y + x=c)

Thus, it has been proved that except Pythagorean Theorem Pieces of Right Triangles we use all other properties.

8 0
4 years ago
Read 2 more answers
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