Answer: B) 40 miles per hour
Step-by-step explanation:
Each twelve minutes is 1/5 hr = 0.2 hr
Total time is therefore 1 hr+ 0.2hr = 1.2hr
Vavge = 48 miles / 1.2 hr = 40 miles/hr
Answer:
d.
Step-by-step explanation:
add 5+9=14
divide by 2=7
Answer:
x=1.5
Step-by-step explanation:
We are trying to get x by itself to see what it equals.
6(2x+3)=36
So first you want to distribute you proprieties. You do that by multiplying 6 and 2x. Then multiplying 6 and 3.
12x+18=36
Now in equations where you need to find the variable, whatever you do on one side of the equal sign, you have to do on the other side. So now we want to subtract 18 from both sides.
12x+18=36
-18 -18
Then we divide 12 from both sides.
12x=18
÷12 ÷12
Now you have your answer!
x=1.5
Answer:
B. 9 : 21
Step-by-step explanation:
Multiply numerator and denominator by 3:
... 3/7 × 3/3 = 9/21 ⇒ 9 : 21
_____
Any denominator that is not a multiple of 7 will not work. 35 is a multiple of 7 (=5×7), but 12 (=4×3) is not the same multiple of 3.
1 and 1/2 is the same as 1.5 and 1.5 * 4 is 6 so I would say 4
