Answer:
75 chairs
Step-by-step explanation:
1. 9x+3 : write equation
2. 7x+19 : write equation
3. 9x+3=7x+19 : make both equations equal to each other
4. 2x+3=19 : subtract 7x from both sides
5. 2x=16 : subtract 3 from both sides
6. 8 : divide 2 on both sides of the equal sign
7. 9(8)+3=75 : plug 8 into the equation
Answer:
yes, the meal costs 25.60
Step-by-step explanation:
I used a slightly different method but B (Yes. They have enough to pay their bill: 21 dollars times 1.06 = 22 dollars and 26 cents and 22 dollars and 26 cents times 1.15 = 25 dollars and 60 cents.) is correct.
21*0.06=1.26
1.26+21=22.26
22.26*0.15=3.34
22.26+3.34=25.60
Answer:
0.2207
Step-by-step explanation:
Here, we want to find the probability that the sample mean is greater than 25.
What we use here is the z-scores statistic
Mathematically;
z-score = (x-mean)/SD/√n
From the question;
x = 65, mean = 63, SD = 13 and n = 25
Plugging these values in the z-score equation, we have
Z-score = (65-63)/13/√25 = 2/13/5 = 0.77
So the probability we want to calculate is ;
P(z > 0.77)
This can be obtained from the standard normal distribution table
Thus;
P(z > 0.77) = 0.22065 which is 0.2207 to 4 d.p
I belive [c] is the answer 37/100 47/100
hope this help have a great day :D
