Which expression has a value of 1, when x = 2 and y = 4?

a: (2 squared + 8) / 4 - 2
b: (2 squared + 8) / (4 - 2)
c: 2 squared + 8 / (4 - 2)
d: 2 squared + 8 / 4 -2

make sure you use the order of operations:

1. simplify expressions inside parentheses.
2. evaluate exponents or radicals.
3. multiply and divide, in order, from left to right.
4. add and subtract, in order, from left to right.

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

80° is the measure of gh

step-by-step explanation:

circle f is congruent to circle j

we have two circle with center f and j.

both circles are congruent. the radius of the circle would be equal.

see the attachment for the circle.

we are given ∠efd ≅ ∠gjh

therefore, arc (ed) = arc (gh)     (∴ circle f is congruent to circle j)

but ∠dfe=80°=arc (ed)

therefore, arc (gh) = 80°

thus, 80° is the measure of gh