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3 years ago

I only need help with number 7

Mathematics

1 answer:

Reil [10]3 years ago

3 0

a,c,d are all correct

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Question 11 options:

9966 [12]

Answer:

x = 12

length = 4 cm

width = 20 cm

Step-by-step explanation:

a = lw

Plug in the givens

80 = (x - 8)(x + 8)

Multiply

80 = x^2 - 64

Add 64 to both sides

144 = x^2

Take the square root of both sides

x = ±12

(The negative root is extraneous since the dimensions can not be negative)

x = 12

length = x - 8 = 4 cm

width = x + 8 = 20 cm

7 0

2 years ago

A certain chalkboard manufacturer determines that their largest blackboard model has a mean length of 5.00 m and a standard devi

Igoryamba

Answer:

23 chalkboards

Step-by-step explanation:

Given:

Mean length = 5 m

Standard deviation = 0.01

Number of units ordered = 1000

Now,

The z factor = $\frac{\textup{x - Mean}}{\textup{standard deviation}}$

The z factor = $\frac{\textup{4.98 - 5}}{\textup{0.01}}$

Z = - 2

Now, the Probability P( length < 4.98 )

Also, From z table the p-value = 0.0228

therefore,

P( length < 4.98 ) = 0.0228

Hence, out of 1000 chalkboard ordered (0.0228 × 1000) = 23 chalkboard are likely to have lengths of under 4.98 m.

7 0

3 years ago

Bella saw that 7 out of 11 people brought an umbrella to the beach. There were 99 people there. How many of them did NOT have an

Alex

36 of them did not have an umbrella because out of 11 people, 4 did not bring an umbrella.

5 0

3 years ago

Read 2 more answers

What is the factored term form of 2x^3+4x^2-x

Westkost [7]

Answer: $x(2x^2+4x-1)$

Step-by-step explanation:

2x³+4x²-x, first find the Greatest Common Factor (GCF), which is x. To find the GCF, look at what all the numbers have in common, and then see if it has the greatest value. Next factor out the GCF.

$x(\frac{2x^3}{x} + \frac{4x^2}{x}-\frac{x}{x} )$ Simplify each term in the parentheses.

$x(2x^2+4x-1)$

Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! :-)

- Cutiepatutie ☺❀❤

8 0

3 years ago

The equation of a line is −2x 5y=−20−2x 5y=−20. what is the x-intercept of the line? enter your answer in the box.

kotegsom [21]

The criteria to find out the x-intercept of the line is we find out the result when
y = 0

- 2x + 5y = -20
- 2x + 0 = -20

x = -20 / -2
x = 10

hope this helps

5 0

3 years ago