Exam: final
7. the length of a rectangle is 2x - 3 and the width
is x + 1. which of the following represents the
perimeter of the rectangle?
a. 2x²+x-3
b. 2x2 - x-3
c. 6x+4
d. 6x-4

D)

Step-by-step explanation:

Perimeter of a rectangle = 2(length + width)

where,

Length = 2x - 3; width = x + 1

Thus,

Collect like terms in the bracket

Expand the bracket

D. 6x-4

Step-by-step explanation:

Since the perimeter of rectangle is;

2 [length + width]

length = (2x - 3)

width = (x + 1)

2 [(2x - 3) + (x + 1)]

4x - 6 + 2x + 2

6x - 4

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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