Answer:
4.20
Step-by-step explanation:
Given data:
the average increase in sales 'x' = 18
ad campaign will increase sales for a fast-food chain 'μ'= 15
standard deviation 'σ'= 5
random sample of stores 'n'=49
In order to determine z-value, we use the formula i.e
z=( x-μ ) / (σ/
)
z=( 18-15) / (5/
)
z= 3/ 0.714
z= 4.20
Answer:
the cyclists rode at 35 mph
Step-by-step explanation:
Assuming that the cyclists stopped, and accelerated instantaneously at the same speed than before but in opposite direction , then
distance= speed*time
since the cyclists and the train reaches the end of the tunnel at the same time and denoting L as the length of the tunnel :
time = distance covered by cyclists / speed of cyclists = distance covered by train / speed of the train
thus denoting v as the speed of the cyclists :
7/8*L / v = L / 40 mph
v = 7/8 * 40 mph = 35 mph
v= 35 mph
thus the cyclists rode at 35 mph
Answer:
m=-3 b=6
Step-by-step explanation:
3y= -6x + 9
divide everything by 3
y=-3x+6
m=-3 b=6
Answer:
Step-by-step explanation:
The applicable rules of exponents are ...
(a^b)(a^c) = a^(b+c)
a^-b = 1/a^b
(a^b)^c = a^(bc)
__
Your expression simplifies as follows:
Answer:
Devin will need 9 cubes of wax.
Step-by-step explanation:
To find the volume of the pyramid, you use (area of the base)* height of the pyramid divided by 3. You know the volume of a cube of wax is 32 cm^3. The volume of your pyramid is 270 cm^3. 270/32=8.4375.
Once you get 8.4375 cubes, you round to the next whole number, which is nine.
