Answer:
75 units²
Step-by-step explanation:
Bigger rectangle: length * width
: 10 * 9
: 90 units²
smaller rectangle: length * width
: 3 * 5
: 15 units²
Shaded region = Bigger rectangle - smaller rectangle
= 90 units² - 15 units²
= 75 units²
The second one, x=(0.18)(23.5)
Step-by-step explanation:
Solve the first eqn for b, b=13–2*a, and the 2nd for c, c=(6*a+5)/3. Then
b+c=13–2*a+(6*a+5)/3=13–2*a+2*a+5/3=44/3. We see that b+c has a definite value because the terms in a cancel.
Part A: c for cost. c=0.31m+0.5
0.31m is the cost per minute. 0.5 is cost per call.
Part B: 0.31m+0.5=5.15 to solve we must rearrange.
subtract 0.5 from each side giving us 0.31m=4.85
divide by 0.31 giving us m=15.65
