Answer:
Barbara's speed in clear weather is and in the thunderstorm is .
Step-by-step explanation:
Let be the speed and be the time Barbara drives in clear weather, and let be the speed and be the time she drives in the thunderstorm.
Barbara drives 22 mph lower in the thunderstorm than in the clear weather; therefore,
(1).
Also,
(2).
(3). ,
and
(4).
From equations (2) and (3) we get:
putting these in equation (4) we get:
and substituting for from equation (1) we get:
This equation can be rewritten as
which has solutions
We take the first solution because it gives a positive value for
.
Thus, Barbara's speed in clear weather is and in the thunderstorm is .
Step-by-step explanation:
6+3b=6+3(7)=6+21=27
Very easy
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There are nine square feet in one square yard because one yard equals 3 feet and the area of a square is solved by multiplying a side by itself, that makes 3 ft * 3ft = 9 square feet. So, if there are 30 square yards, then you would multiply 30*9 which gives you 270 square feet. Hope this helps!
Answer
1• 2/5÷7/8
if there is a division sign in between two fractions what u have to do is multiply and, the fraction at the right need to change
=2/5×8/7
=16/35
=0•457
2• 3/4÷6/5
3• 3/5÷7/8
=3/5×8/7
=24/35
=0•6857
4• 3/4÷5/6
=3/4×6/5
=18/20
=0•9