Answer:

Step-by-step explanation:

Switch sides:

Multiply both sides by 9:


Divide both sides by 5:


Add 32 to both sides:


Answer:
0.67 cm/s
Step-by-step explanation:
The area of a square is given by :
....(1)
Where
x is the side of a square

Differentiating equation (1) wrt t.

When A = 81cm², the side of the square, x = 9 cm
Put all the values,

So, the length of the side of a square is changing at the rate of 0.67 cm/s.
Answer:
Q= 6x+1
R= -7x+1
Step-by-step explanation:
Answer: 5%
Step-by-step explanation:
A meteorologist predicted that Monday's hight temperature would be 76F and on Monday, the temperature reached 80F.
The percentage error will be
Percentage error=
(Exact value-Forecasted value)/exact value x 100
= 76-80/80 × 100
= -4/80 × 100
=4/80 × 100
= 400/80
= 5%
The percentage error is 5%.
Answer:
30 miles
Step-by-step explanation:
20 x 3 is 60 minutes
10 x 3 is 30 miles