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2 years ago

Solve the following quadratic equation by rearranging and then factorising x^2 + 7x + 19 = 9

Mathematics

2 answers:

IRISSAK [1]2 years ago

6 0

Answer:

x = -5 & x = -2

Step-by-step explanation:

x^2 + 7x +10 = 0 you takeaway 9 as quadratic equations have to equal 0

(x+5)(x+2) = 0 you find 2 numbers that go into 10 that add to make 7 and multiply to make 10

(x+5) = 0 so x =-5 & (x+2) = 0 so x =-2

wolverine [178]2 years ago

5 0

Answer:

your lucky you did have a online lessons earlll

Step-by-step explanation:

The following are the temperatures in °C for the first 14 days of January:

-6, -2.5, 2, 2.5, -0.5, 5, 10, -3, -7, 3, -1, 7, 1, 4.5

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Which expression is equivalent to 4 square root 3^3 <br> A 3 3/4<br> B 3 4/3<br> C 4^1<br> D 4^3

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2 years ago

The Ohio Department of Agriculture tested 203 fuel samples across the state in 1999 for accuracy of the reported octane level. F

OlgaM077 [116]

Answer:

The Sample size is 1918.89035

Step-by-step explanation:

Consider the provided information.

It is given that 14 out of 105 samples failed.

Therefore p = 14/105 = 0.13 3... and q=1-0.133=0.867

Samples would be needed to create a 99 percent confidence interval.

Subtract the confidence level from 1, then divide by two.

$\frac{(1 -0.99)}{2}=0.005$

By standard normal table z=2.5758≈2.58

Calculate the sample size as:

$n=\frac{z^2pq}{e^2}$

Where, e is the margin of error,

Substitute the respective values.

$n=\frac{(2.58)^2(0.133)(0.867)}{(0.02)^2}=1918.89$

Hence, the Sample size is 1918.89035

4 0

2 years ago

Marta_Voda [28]

Answer:

138 fluiere, 158 ocarine, 184 viori

Step-by-step explanation:

given:

(1) fluiere + ocarine +viori = 480

(2) fluiere + ocarine =296

(3) ocarine + viori =342

din ecuatia (3) avem: viori= 342-ocarine

din ecuatia(2) avem : fluiere= 296-ocarine

in ecuatia (1) inlocuieste ce ai gasit ca sa fie o ecuatie doar cu necunoscuta ocarine: fluiere + ocarine +viori = 480

296-ocarine +ocarine+ 342-ocarine =480

296+342-480 = ocarine =158

viori = 342-158 = 184

fluiere = 296-158 = 138

8 0

2 years ago

How many solutions does the following equation have?

RoseWind [281]

Answer:

There will be No solution for the equation $9x - 4 = - 3x + 5 + 12x$ . Option B is correct.

Step-by-step explanation:

We need to determine how many solutions the equation $9x - 4 = - 3x + 5 + 12x$ have.

Solving the equation and finding the solutions

$9x - 4 = - 3x + 5 + 12x$

Combining like terms, Moving 3x and 12x to left side of equality and changing their signs and moving 4 on right side of equation and changing sign.

$9x +3x-12x = 5 + 4$

Simplifying

$12x-12x = 9\\0=9$

Solving the equation we get 0=9 which is false. So, there will be No solution for the equation $9x - 4 = - 3x + 5 + 12x$ . Option B is correct.

5 0

2 years ago

Danielle is creating a scale drawing of her room. the rectangular room measures 20 1/2 by 25ft. if her drawing uses the scale wh

valkas [14]

NO, The drawing will be 10 1/4 inches by 12 inches, which is bigger than the paper.

8 0

2 years ago

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