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4 years ago

5

3(x+1)+5(x+1)=64 What is x

2 answers:

IrinaK [193]4 years ago

8 0

Answer:

x is 3

Step-by-step explanation:

because 3×2=6+2=8×8=64

Karo-lina-s [1.5K]4 years ago

6 0

Answer:

x=7

Step-by-step explanation:

3(x+1)+5(x+1)=64

(3+5)(x+1)=64

8(x+1)=64

8x+8=64

8x=56

x=7

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mash [69]

Answer:

g(q) = $\frac{5q}{8}$

Step-by-step explanation:

Given

- 7q + 12r = 3q - 4r

Rearrange making r the subject

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g(q) = $\frac{5q}{8}$

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3 years ago

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jonny [76]

Answer:

C

Step-by-step explanation:

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3 years ago

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3 years ago

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Trina, James, and Michael are training for a 10-kilometer race. After 30 minutes of a training run, Michael lead the group, and

Llana [10]

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1/3

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5 0

3 years ago

The manufacturer of hardness testing equipment uses steel-ball indenters to penetrate metal that is being tested. However, the

kumpel [21]

Answer:

Check the explanation

Step-by-step explanation:

Let X denotes steel ball and Y denotes diamond

$\bar{x_1}$ = 1/9( 50+57+......+51+53)

=530/9

=58.89

$\bar{x_2}$ = 1/9( 52+ 56+....+ 51+ 56)

=543/9

=60.33

difference = d =(60.33- 58.89)

=1.44

$s^2=1/n\sum xi^2 - n/(n-1)\bar{x}^2$

s12 = 1/9( 502+572+......+512+532) -9/8 (58.89)2

=31686/8 - 9/8( 3468.03)

=3960.75 - 3901.53

=59.22

s1 = 7.69

s22 = 1/9( 522+ 562+....+ 512+ 562) -9/8 (60.33)2

=33295/8 - 9/8 (3640.11)

=4161.875 - 4095.12

=66.75

s2 =8.17

sample standard deviation for difference is

s= $\sqrt{[(n1-1)s_1^2+ (n2-1)s_2^2]/(n1+n2-2)}$

= $\sqrt{[(9-1)*59.22+ (9-1)*66.75]/(9+9-2)}$

= $\sqrt{1007.76/16}$

=7.93

sd = $s*\sqrt{(1/n1)+(1/n2)}$

= $7.93*\sqrt{(1/9)+(1/9)}$

=7.93* 0.47

=3.74

For 95% confidence level $Z (\alpha /2)$ =1.96

confidence interval is

$d\pm Z(\alpha /2)*s_d$

=(1.44 - 1.96* 3.75 , 1.44+1.96* 3.75)

=(1.44 - 7.35 , 1.44 + 7.35)

=(-2.31, 8.79)

There is sufficient evidence to conclude that the two indenters produce different hardness readings.

3 0

3 years ago