Answer:
-44
Step-by-step explanation:
Since a is -2 and y equals 7 we can plug them both into the expression to get -2 - 6(7) which after simple math results in the answer of -44.
Answer:
80d:1t
Step-by-step explanation:
320mi:4h
80mi:1h
80d:1t
Every hour the train travels 80 miles
Answer:
18 ft/ 20 min = 0.90 ft/min is the greatest speed.
Step-by-step explanation:
You must find the unit rate of change for all four items: A through D. This will require some conversion of units of measurement. Next you must determine which of your four results is the greatest / fastest.
A. 18 ft / 20 min = 9/10 ft/min, or 0.90 ft/min
B. 90 ft / 2.5 hr = 90 ft / 150 min = 6/10 ft/min, or 0.6 ft/min
C. 20 yd / 1.5 hr = 60 ft / 90 min = 6.7/10 ft/ min, or 0.67 ft/min
D. 3 2/3 yd / 15 min = (11/3)(3 ft) / 15 min = 7.3/10 ft /min, or 0.73 ft/min
Arranged in increasing size, we have:
6/10 ft/min, 6.7/10 ft/min, 7.3/10 ft/min and 9/10 ft/min.
The first answer choice, 9/10 ft/min, is the greatest speed.
Given:
40 stores in total
55% of the stores are in California, the rest are in Nevada.
This is simply multiplying the corresponding percentage from the whole to get its number and deducting the number to get the required number.
40 represents 100%.
40 x 55% = 22 stores in California
40 - 22 = 18 stores in Nevada.
There are 18 stores in Nevada.
Since 55% represents California, then, 45% represents Nevada.
40 * (100% - 55%) = 40 * 45% = 18 stores.
Answer:
3972.72 specimens
Step-by-step explanation:
We solve using the z score formula:
z = (x-μ)/σ where
x is the raw score = 73 cm
μ is the population mean = 147 cm
σ is the population standard deviation = 30 cm
N is the number of samples = 4000
For x > 73
z = 73 - 147/30
z = -2.46667
Probability value from Z-Table:
P(x<73) = 0.0068189
P(x>73) = 1 - P(x<73) = 0.99318
The probability of having a height greater than 73cm is: 0.99318
The number of specimens that have a height greater than 73cm is calculated as: 0.99318 × 4000
= 3972.72 specimens