Answer:
(0, -5) and (4, 3)
Step-by-step explanation:
I assume you're looking for the coordinates of the intersections, if any.
Solve by substitution:
x² + (2x − 5)² = 25
x² + 4x² − 20x + 25 = 25
5x² − 20x = 0
5x (x − 4) = 0
x = 0 or 4
So the coordinates are (0, -5) and (4, 3).
Answer:
amplitude = 3
Step-by-step explanation:
The standard form of a cosine function is
f(x) = a cos(bx + c) + d
amplitude = | a |, period = 
phase shift = -
, d is the vertical shift
Given the above function, then
amplitude = | - 3 | = 3
Answer:
v = 1.45 × 10⁷ m/s
Step-by-step explanation:
Given:
Inner radius of the cylinder, r₁ = 20 mm = 0.2 m
outer radius of the cylinder, r₂ = 80 mm = 0.8 m
Potential difference, ΔV = 600V
Now, the work done (W) in bringing the charge in to the inner conductor
W = 
where, m is the mass of the electron = 9.1 × 10⁻³¹ kg
v is the velocity of the electron
also,
W = qΔV
where,
q is the charge of the electron = 1.6 × 10⁻¹⁹ C
equating the values of work done and substituting the respective values
we get,
qΔV = 
or
1.6 × 10⁻¹⁹ × 600 = 
or

or
v = 14525460.78 m/s
or
v = 1.45 × 10⁷ m/s
Answer:
E) They are using less electricity than expected.
Step-by-step explanation:
The residual mean value is the observed value minus the predicted or expected value. If it is negative it means that the expected value of electricity usage is higher than the observed electricity usage value, so they are using less electricity than expected.
Answer:
4 sq ft
Step-by-step explanation:
1/2 x 4 x 2