4/7 = 12/21
12/21 = x + 3/21
9/21 = x
Hope this helped!!
Step-by-step explanation:
The general form of the quadratic equation is :
The given equation is x²+4x+20=0
On comparing the given equation and the general equation, we find that
a = 1, b = 4 and c = 20
Hence, the correct option is a=1 b =4 c = 20.
If the equation is 2x²+6x+5=0, then
a = 2, b = 6 and c = 5
If the equation is -2x²+x+5
a = -2, b = 1 and c = 5
Answer:
2.5% of IQ scores are no more than 65
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean = 95
Standard deviation = 15
Using the empirical rule, what percentage of IQ scores are no more than 65?
65 = 95 - 2*15
So 65 is two standard deviations below the mean.
By the Empirical Rule, 95% of the measures are within 2 standard deviation of the mean. Of those 5% which are not, 2.5% are more than 2 standard deviations above the mean and 2.5% are more than 2 standard deviations below the mean.
So 2.5% of IQ scores are no more than 65
Hi there!
The total cost for a adults can be determined by multiplying the total amount of adults by the price per adult.
Price per adult = $3.50
Amount of adults = a
Total cost = 3.5a
The total cost for c children can be determined by multiplying the total amount of children by the price per child.
Price per adult = $2
Amount of adults = c
Total cost = 2c
The total cost for parents and children is
3.5a + 2c
The total cost for a family (2 adults and 3 children) can be found by plugging in 2 for 'a' and 3 for 'c'.
Therefore, we get the following:
Total cost = 3.5 × 2 + 2 × 3 = 7 + 6 = 13
Hence, the answer is $13
~ Hope this helps you.
Answer:
3
Step-by-step explanation:
