3 years ago

Of the 245 7th graders, 40% of them are in band. How many 7th graders are in band?

1 answer:

8 0

Answer: 98 students

Explanation:
1. Turn 40% into a decimal by removing the “%” and placing “0.” In front of it. (0.4)
2. Multiply the decimal (0.4) by the number of students (245) to get the answer. (0.4x245=98)

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A jar contains 2 green marbles, 4 blue marbles, and 3 yellow marbles. A marble is chosen at random from the jar and replaced. Fi

omeli [17]

Answer:

2/27

Explanation:

• Number of green marbles = 2

• Number of blue marbles = 4

• Number of yellow marbles = 3

Total = 2+4+3 =9

• Probability of choosing a green marble = 2/9

• Probability of choosing a yellow marble = 3/9

Therefore, the possibility that the first marble is green and the second is yellow is:

$\begin{gathered} =\frac{2}{9}\times\frac{3}{9} \\ =\frac{2}{27} \end{gathered}$

8 0

1 year ago

If a rectangle is 2 meters more than its width, and the area of it is 80 square meters, what is the length and width?

bezimeni [28]

Ok I think it means that the length $l$ of the rectangle is 2 m more than is width $w$ ...
The area is A= $l*w=(w+2)*w=80$
so: $w^{2} +2w-80=0$
Solving this equation (using the quadratic formula) you get 2 solutons. The only acceptable is the positive one, i.e. $w=8 m$ , the length will then be $l=w+2=8+2=10m$ .