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arsen [322]
3 years ago
11

I am having trouble with these equations 7x + 2y = - 8 8y = 4x solve using substitution

Mathematics
1 answer:
dybincka [34]3 years ago
5 0
X = -1 y = -0.5
7 times -1 = -7.
2 times -0.5 = -1, -1+-7= -8
8y= -4, 4x= -4,
Hope this helps!
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The height of adult males on a given South Pacific Island is approximately normally distributed with mean 65 inches and standard
zvonat [6]

Answer:

a) 0.59871

b) 0.22663

e) 0.95994

Step-by-step explanation:

The height of adult males on a given South Pacific Island is approximately normally distributed with mean 65 inches and standard deviation of 4 inches.

We solve using z score

z = (x-μ)/σ, where

x is the raw score

μ is the population mean = 65 inches

σ is the population standard deviation = 4 inches

a). Taller than 64 inches

This means x > 64

Hence,

64 - 65/4

=- 1/4 = -0.25

P-value from Z-Table:

P(x<64) = 0.40129

P(x>64) = 1 - P(x<64) = 0.59871

b.) shorter than 62 inches

Hence,

62 - 65/4

=- 3/4 =- 0.75

P-value from Z-Table:

P(x<62) = 0.22663

c.) between 64 inches and 68 inches

Hence,

for 64 inches

64 - 65/4

=- 1/4 = -0.25

P-value from Z-Table:

P(x = 64) = 0.40129

For 68 inches

Hence,

68 - 65/4

= 3/4= 0.75

P-value from Z-Table:

P(x = 68) = 0.77337

d.) between 58 and 68 inches

e.) taller than 58 inches

Hence,

58 - 65/4

= -6/4 = -1.5

P-value from Z-Table:

P(x<58) = 0.040059

P(x>58) = 1 - P(x<58) = 0.95994

7 0
3 years ago
a man paid $8000 for a car since then ,its value has fallen by 25% calculate the current value please help me​
Anna [14]

Answer:

$6000

Step-by-step explanation:

so basically, 25% of the 100% value is gone, right? which means that 75% of the value would remain. After that, all is easy. 8000*0.75, since 75% is 0.75, and the answer of that is 6000, so the current value is 6000 dollars.

3 0
2 years ago
Roger made a table showing how he spent his time in one day. How many days
Kazeer [188]

Answer:

3 days will pass

Step-by-step explanation:

work 24×1/3=8

sleep 24×3/8=9

meals 24×1/8=3

computer 24×1/6=4

reach up to 24 with sleep

9+9+9=27

which took a little over 3 days

5 0
2 years ago
For a school event, of the athletic field is reserved for the fifth-grade classes.
Rashid [163]

Answer:

1/4

Step-by-step explanation:

4 classes, each class gets one spot!

4 0
3 years ago
If w=the weight of a trout, which algebraic expression represents the phrase below?
ivann1987 [24]

Answer:

A

Step-by-step explanation:

The only option with multiplication represented is A.

6 0
3 years ago
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