Translate this phrase into an algebraic expression.
54 decreased by twice Vidya's savings
Use the variable y to represent Vidya's savings.
we have
<h2>54-2y</h2>
because
twice Vidya's savings -------> 2y
so
54 decreased by twice Vidya's savings
54-2y
Answer:

Step-by-step explanation:
Step 1 - As both triangles have lengths the same size, they both add together to equal a rectangle. Therefore:
4 x 3 = 12
Which is the area of the triangles.
Step 2 - Calculating the area of a circle uses the formula:

Where r is the radius of the circle.
Plug the known variables in:

However, this is the area of a full circle. The figure is only half a circle so we must divide this by two:
28.26 ÷ 2 = 14.13
Now, add the area of the semi-circle to the area of the triangles:
14.13 + 12 = 26.13
Therefore, the area of the figure is
.
Hope this helps!
Answer:
80%
Step-by-step explanation:
23.1/115.5=0.2
1-0.2=0.8=80%
Answer:
37.7 mi²/h
Step-by-step explanation:
The area formula is ...
A = πr²
Differentiating with respect to time gives ...
dA/dt = 2πr·dr/dt
Filling in the given values, we have ...
dA/dt = 2π(3 mi)(2 mi/h) = 12π mi²/h
The area is increasing at the rate of about 37.7 mi² per hour.