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3 years ago

7×3=(_×3)+(4×3)= what is the missing number and answe

Mathematics

2 answers:

iris [78.8K]3 years ago

8 0

Answer:

3 is the missing answer.

Step-by-step explanation:

7 * 3 = ( _ * 3) + ( 4 * 3)

21 = ( _ * 3) + 12 -Multiply 4 * 3 and 7 * 3

9 = _ * 3 -Divide both sides by 3

3 = missing number

cestrela7 [59]3 years ago

6 0

7x3=21 4x3=12 21-12=9 9/3 is 3 so the missing number is 3

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What is the prime factorization of 42? 2 × 3 × 4 2 × 3 × 7 3 × 3 × 4 3 × 3 × 7

aleksklad [387]

$2 \times 3 \times 7$

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3 years ago

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What is the slope of y = -5 + 4x

xxTIMURxx [149]

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3 years ago

How would I find the Max/min of this function f(x) = 2x squared +18x +16

slamgirl [31]

F(x)=2x²+18x+16
1) we have to calculate the first derived.

f´(x)=4x+18

2) Now, we equalize the first derived to "0" and find out the value of "x"
4x+18=0
4x=-18
x=-18/4=-4.5

3)we calculate the second derived
f´´(x)=4>0 ⇒we have a minimum at x=-4.5

4) Now we calculate the value of "y".
f(-4.5)=2(-4.5)²+18(-4.5)+16=40.5-81+16=-24.5

Therefore; Exist a minimum at (-4.5 , -24.5)

7 0

3 years ago

Geometry Help!

Elina [12.6K]

Answer:

x = 88.76°

Step-by-step explanation:

Use the law of cosines:

cos C = (a² + b² - c²)/(2ab)

Apply to the given triangle and solve for x:

cos x = (52² + 48² - 70²)/(2*52*48)
cos x = 108/4992
cos x = 0.02163461538
x = arccos 0.02163461538
x = 88.76°

4 0

3 years ago

The Acculturation Rating Scale for Mexican Americans (ARSMA) is a psychological testdeveloped to measure the degree of Mexican/S

maria [59]

Answer:

95% confidence interval for the mean ARSMA score for first-generation Mexican Americans

(2.13264 , 2.58736)

Step-by-step explanation:

Step(i):-

Mean of the Population = 3.0

Standard deviation of the Population = 0.8

Given Mean of the sample(x⁻ ) = 2.36

Standard deviation of the sample (S) = 0.8

size of the sample = 50

Level of significance =0.05

Degrees of freedom = n-1 = 50-1 = 49

$t_{\frac{0.05}{2} , 49} = 2.0096$

Step(ii):-

95% confidence interval for the mean ARSMA score for first-generation Mexican Americans

$(x^{-} - t_{(\frac{\alpha }{2},df )} \frac{S}{\sqrt{n} } , (x^{-} +t_{(\frac{\alpha }{2},df )} \frac{S}{\sqrt{n} })$

$(2.36 - 2.0096 \frac{0.8}{\sqrt{50} } , 2.36 +2.0096\frac{0.8}{\sqrt{50} })$

( 2.36 - 0.22736 , 2.36 + 0.22736)

(2.13264 , 2.58736)

Final answer:-

95% confidence interval for the mean ARSMA score for first-generation Mexican Americans

(2.13264 , 2.58736)

7 0

3 years ago