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Sedaia [141]
3 years ago
7

Please Find the solution to the following system using substitution or elimination: y = 3x + 7 y = -2x -3

Mathematics
1 answer:
Dmitrij [34]3 years ago
5 0
Answer: A (-2, 1)
see image explanation attached

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If f(x) = 2x - 6 and g(x) = 3x + 9, find (f + g)(x)
alex41 [277]

Answer:

5x+3

Step-by-step explanation:

(f + g)(x) = f(x) + g(x) \\  =2x - 6 + 3x + 9 \\  = 5x + 3

consider marking as Brainliest if this helped

5 0
3 years ago
The radioactive substance cesium-137 has a half-life of
statuscvo [17]
A(t)=A0*(1/2)^(t/30)
where t=elapsed years
A0=initial mass at t=0.
7 0
3 years ago
How do I figure out the value of 187
nasty-shy [4]
This differs on what number you want to talk about. 1 is the hundreds, 8 is the tenths, 7 is the ones. 
5 0
3 years ago
How many times does the graph of the function below interect or touch the x-axis? y=-2x^2+3x+5
Andrei [34K]

Answer:

Two times at (-1,0) and (2.5,0)

Step-by-step explanation:

When the graph intersects or touches x-axis, y is equal to 0

so y = -2x^2 + 3x + 5

=> 0 = -2x^2 + 3x + 5

The formula to solve a quadratic equation of the form ax^2 + bx + c = 0 is equal to x = [-b +/-√(b^2 - 4ac)]/2a

so a = -2

    b = 3

    c = 5

substitute in the formula

x = [-3 +/- √(3^2 - 4x-2x5)]/2(-2)

x = [-3 +/- √(9 + 40)]/(-4)

x = [-3 +/- 7]/(-4)

x1 = (-3 + 7)/(-4) = 4/-4 = -1

x2 = (-3 - 7)/(-4) = -10/-4 = 5/2 = 2.5

so the graph has two x-intercepts (-1,0) and (2.5,0), therefore it intersects x-axis two times

7 0
3 years ago
Victoria earns $255 by working 20 hours each week
Alborosie
She would make $98.50 in 10 hours.

Explanation :
255/20 = 12.75
12.75 - 2.90 = 9.85
9.85 x 10 = 98.50
6 0
3 years ago
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