The area of a trapezoid is
A = (1/2) (h) (b1 + b2).

( 'h' is the height of the trapezoid. 'b1' and 'b2' are its two bases.)

You want the equation solved for one base.

A = (1/2) (h) (b1 + b2).

Multiply each side by 2 : 2A = h(b1 + b2)

Divide each side by 'h' : 2A/h = b1 + b2

Subtract b1 from each side: <em>2A/h - b1 = b2</em>

5 0

4 years ago

All the fourth-graders in a certain elementary school took a standardized test. A total of 81% of the students were found to be

Dvinal [7]

Answer:

The probability that a student is proficient in mathematics, but not in reading is, 0.10.

The probability that a student is proficient in reading, but not in mathematics is, 0.17

Step-by-step explanation:

Let's define the events:

L: The student is proficient in reading

M: The student is proficient in math

The probabilities are given by:

$P (L) = 0.81\\P (M) = 0.74\\P (L\bigcap M) = 0.64$

$P (M\bigcap L^c) = P (M) - P (M\bigcap L) = 0.74 - 0.64 = 0.1\\P (M^c\bigcap L) = P (L) - P (M\bigcap L) = 0.81 - 0.64 = 0.17$

The probability that a student is proficient in mathematics, but not in reading is, 0.10.

The probability that a student is proficient in reading, but not in mathematics is, 0.17

5 0

4 years ago