2. 14x-7-11=6+6x
4.14x-18=6+x
1.8x-18=6
5.8x=24
3.x=3
A+b+c= 3932
a=b+1330
a=c+1740 ⇒c=a-1740⇒c=(b+1330)-1740
Obt.
b+1330 +b+(b+1330)-1740=3932 ⇒3b+2660-1740=3932⇒3b+920=3932⇒3b=3932-920⇒3b=3012⇒b=3012/3⇒
a=b+1330⇒a=1004+1330⇒
c=a-1740⇒c=23334-1740⇒
The average change in temperature from 9 a.m to 9 p.m is - 0.6 ° per hour (negative indicates temperature decreases), if the temperature at 9 a.m was 13.6 ° and the temperature at 9 p.m was 6.4 °.
Step-by-step explanation:
The given is,
The temperature at 9 a.m was 13.6 °
The temperature at 9 p.m was 6.4 °
The temperature at 3 a.m was 23.5 °
Step:1
Hours difference between 9 a.m to 9 p.m is,
= 12 hours (∵ consider a clock for this calculation)
Step:2
Temperature difference between 9 a.m to 9 p.m is,
= 6.4 - 13.6
= - 7.2 °
Step:3
Average change in temperature between 9 a.m to 9 p.m,
= - 0.6 ° ( ∵ Negative indicates temperature reduction)
Result:
The average change in temperature from 9 a.m to 9 p.m is - 0.6 ° per hour ( Negative indicates temperature reduction).
19. State which operation you do first.
a) parentheses
b) parentheses
c) parentheses
d) parentheses
PEMDAS - parentheses, exponents, multiplication, division, addition, subtraction
20. Evaluate each expression in question 19. Show all steps.
a) 4 - 6( -2 )
-6( -2 ) = 12
4 + 12 = 16
Answer: 16
b) (-18) ÷ (-9) - 3
-18 / -9 = 2
2 - 3 = -1
Answer: -1
c) [7-(-3)] ÷ 5
[7-(-3)] = 10
10/5 = 2
Answer: 2
d) 4(-6) ÷ (-2)
4/-6 = -
-2/3 / -2