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3 years ago

Need help this is so confusing and please show work.

Mathematics

1 answer:

AlexFokin [52]3 years ago

6 0

Answer:

Please see attached picture for full solution.

Step-by-step explanation:

You should multiply the number outside the bracket with each term, with their symbols (plus/minus), in the bracket.

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Help me asap!!!! please

Lubov Fominskaja [6]

Answer:

x = 3 should be the answer

Step-by-step explanation:

y is not graphed so y isn't part of the equation while x is so its X = K (K being the number that it goes up on) same thing applies to y if its horizontal then the equation is Y = K)

6 0

2 years ago

Plz look at pic !!!! Plz Help!!! Use proportion to solve

soldi70 [24.7K]

Answer:

It takes 26 2/3 gallons to make a 400 mile trip.

Step-by-step explanation:

This question is simply asking for the number of miles per gallon . In math, per means this is meant to be written as a fraction.

"If a trip of 270 miles required 18 gallons of gas" is actually saying "270 miles per 18 gallons." This can be written as a fraction like so: 270/18.

If we're looking for the amount of gas used for a 400 mile trip, we have the fraction: 400/g, g being the amount of gallons it took to make that trip.

Now we can set up the proportion: $\frac{270}{18} =\frac{400}{g}$

Cross multiply and solve accordingly.

$\frac{270}{18} =\frac{400}{g}$

400 $270g = 400 *18\\ 270g = 7200\\g=26\frac{2}{3}$ /g

So the answer is:

It takes 26 2/3 gallons to make a 400 mile trip.

6 0

4 years ago

g The distribution of heights of 7-year-old girls is approximately normally distributed with a mean of 47.7 inches and a standar

Lana71 [14]

Answer:

a) 90th percentile

b) X = 51.43 ( Sophia's height ) , Amy's height = 50.92

c) 0.2394

d) 46.44 inches

Step-by-step explanation:

mean value( u ) = 47.7 inches

std ( σ )= 2.4 inches

Amy height = 1.34 std above mean value

Sophia height = 94th percentile of height distribution

A ) what percentile is Amy's height

To Calculate the percentile of Amy's height

P( X ≤ 50.916 ) = P( (X-µ)/σ ) ≤ (50.916-47.7) /2.4)

=P(Z ≤ 1.340 ) = 0.9099 = 90th percentile

B) How Amy's height compare to Sophia's

The proportion given based on Sophia's height = 0.94

z -value at the proportion ( 0.94 ) = 1.55 ( from excel )

note z-value can be calculated using = ( x - µ ) / σ

therefore: X (Sophia's height ) = zσ + µ= (1.55 * 2.4) + 47.7

X = 51.43 ( Sophia's height ) , Amy's height = 50.92

C) percentage expected to be taller than 49.4 inches

P ( X ≥ 49.40 ) = P( (X-µ)/σ) ≥ (49.4-47.7) / 2.4)

= P(Z ≥ 0.708 )

= P( Z < -0.708 )

= 0.2394

D) Below what height are the shortest 30% of 7-year old girls

( u ) = 47.7 inches

std ( σ )= 2.4 inches

given proportion = 30% = 0.3

The z value at 0.3 = -0.52 ( from excel )

to calculate for X ( height ) we have to apply the formula used to determine z value

z= (x-µ) /σ

hence : X = (Z * σ) + u = (-0.52 * 2.4 ) + 47.7

X = 46.44

below 46.44 inches lies about 30% of 7 year old girls height

6 0

3 years ago

How do I draw a model for 3 divided by 4

11111nata11111 [884]

I think one model would / could be 3 / 4

5 0

4 years ago

Read 2 more answers

ILL MARK BRAINLIST !!!! * have to get it right *What is the slope of the line?

nevsk [136]

Answer:

1/5

Step-by-step explanation:

the line is going up which means it's positive

7 0

4 years ago