Answer:
10 units
Step-by-step explanation:
We look at the number -7 on the number line and count how many units it is from 3
it looks like you can say 3 - (-7 ) = 10
Answer:
30
Step-by-step explanation:
180-100=80
80+70=150
180-150=30
The game cost $270 & she had $60 & is going to save $30 a week. It would take Reese 7 weeks to save enough money to buy the system.
$270-$60=$210
$210÷$30=7
7 Weeks
Answer: u = (41.659, 36.341)
Step-by-step explanation:
Constructing a 90% confidence interval for mean is given by the formulae below.
u = x + Zα/2 * σ/√n...... This is the upper limit
u = x - Zα/2 * σ/√n........ This is the lower limit.
u = population mean
x = sample mean = 39
σ = population standard deviation = 9
Zα/2 = Z score for a two tailed test with an a level of significance = 1.645 ( for 90% confidence level)
Upper limit
u = 39 + 1.645 * (9/√31)
u = 39 + 1.645 * (1.616)
u = 39 + 2.6590
u = 41.659
Lower limit
u = 39 - 1.645 * (9/√31)
u = 39 - 1.645 * (1.616)
u = 39 - 2.6590
u = 36.341
Answer:
-12.8
Hope this helps! :)