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3 years ago

7

A box contains 4 plain pencils and 4 pens. A second box contains 7 color pencils and 3 crayons. One item from each box is chosen

at random. What is the probability that a pen from the first box and a crayon from the second box are selected?

1 answer:

melamori03 [73]3 years ago

6 0

A pen is 50% .A crayon is less likely to be selected.

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What is the completely factored form of x4 + 8x2 – 9?

Arte-miy333 [17]

ANSWER

$( {x}^{2} + 9)({x} - 1)(x + 1)$

EXPLANATION

The given function is

${x}^{4} + 8 {x}^{2} - 9$

Split the middle term

${x}^{4} + 9 {x}^{2} - {x}^{2} - 9$

Factor by grouping;

${x}^{2} ( {x}^{2} + 9) -1 ({x}^{2} + 9)$

Factor further to get:

$( {x}^{2} + 9)({x}^{2} - 1)$

Apply difference of two squares to get:

$( {x}^{2} + 9)({x} - 1)(x + 1)$

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Use substitution to solve this system of equations. 4x-5y=19 y=8x-11

Soloha48 [4]

$4x-5y=19 \\
y=8x-11 \\ \\
\hbox{substitute 8x-11 for y in the 1st equation and solve for x:} \\
4x-5(8x-11)=19 \\
4x-40x+55=19 \\
4x-40x=19-55 \\
-36x=-36 \\
x=\frac{-36}{-36} \\
x=1 \\ \\
\hbox{substitute 1 for x in one of the equations and solve for y:} \\
y=8 \times 1-11 \\
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3 years ago

What percent of $30 is $7.50?

Nady [450]

Answer:

25%

Step-by-step explanation:

15 is 50% 7.5+7.5= 15=50% =25%+25%

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3 years ago

Whats the answer for this??

aniked [119]

Step-by-step explanation:

what do you mean "what's the answer for this ?"

you only need to put 3 in place of x (that's what is meant by "x is 3" or x = 3) and then simply calculate.

you know what "squaring" ("something to the power of 2" or x²) means ? it means that you have to multiply that "something" by itself.

y = 3² + 11 = 3×3 + 11 = 9 + 11 = 20

that's all there is to this.

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Afina-wow [57]

Answer: Simple interest= Principal× rate× time/ 100

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Step-by-step explanation:

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