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Vladimir79 [104]
4 years ago
7

Lina has a total of 72 blue and red marbles in a box. The probability of choosing a blue marble at random from the box is 4/9

Mathematics
1 answer:
blsea [12.9K]4 years ago
3 0

Answer:

28

Step-by-step explanation:

probability of getting blue ball is 4/9

total cases = 72

i.e number of blue ball 32

number of red vall is 40

so extra 28 is added

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What is the axis of symmetry for f(x)=32+9x+15 ?
Alex787 [66]

Answer:

The axis of symmetry is

x=-\frac{3}{2}

Step-by-step explanation:

The given function is f(x)=3x^2+9x+15.

Compare to f(x)=ax^2+bx+c,

a=3,b=9,c=15

The axis of symmetry of the parabola is given by the formula;

x=-\frac{b}{2a}

We substitute into the formula to get;

x=-\frac{9}{2(3)}

The axis of symmetry is

x=-\frac{3}{2}

6 0
3 years ago
The area of a rectangular classroom is given by the trinomial 10x^2 + 3x - 4 What are the possible dimensions of the classroom?
juin [17]
Answer: The expression factors to (2x - 1)(5x + 4)

In a rectangle the area is L x W. So if we know the area is 10x^2 + 3x - 4, then all we have to do is factor it to find possible values for the L and W.

If you factor the expression by grouping, you will get (2x - 1) and (5x + 4).

Your questions asks for possible dimensions, you could give the two expressions as dimensions.

If you wanted to select a value for x, you could plug it in and get values that could be dimensions.

For example if you let x = 10, you would have a rectangle that has a width of 19 and a length of 54.
7 0
3 years ago
How do I find the area of the non-shaded figure?!?
gtnhenbr [62]

Answer:

51 cm²

Step-by-step explanation:

rectangle = 6x12=72

triangle = 1/2(7)(6)=21

Non-shaded=72-21=51 cm²

5 0
3 years ago
Read 2 more answers
Sue withdrew $85 a month from her savings account for 7 months. what was the change in her balance?
Ivan

Answer:

-595 was the change in her balance

Step-by-step explanation:

85*7=595

Withdrew=Negative(-)

8 0
4 years ago
A pairs of fair dice is tossed . What is the probability of not getting a sum 5 or 9 ?
mrs_skeptik [129]

Answer:

28/36 or 7/9

Step-by-step explanation:

there are 36 possible answers

4 of them equal 5 (1+4, 2+3, 3+2, 4+1)

4 of them equal 9 (3+6, 4+5, 5+4, 6+3)

8-36 = 28

3 0
4 years ago
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