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3 years ago

PLZ HELP I HAVE A MATH TEST FINAL AND THIS IS GOING TO BE ON THE TEST 0.3(6z+7.2)=0.5(8z+4)-0.94

Mathematics

1 answer:

SOVA2 [1]3 years ago

7 0

Answer:

oh god let me try help

Step-by-step explanation:

hm, I seemed to have gotten 7.42 my deepest apologies if it's incorrect!! :(

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Mrs. Williams needed to make 4 1/2 of fruit salad for a class party.

ziro4ka [17]

Answer:

strawberry=7/8

Step-by-step explanation:

treat strawberry as x

add on proportions

1 1/8+ 3/4+ 1 3/4 + x = 4 1/2

(9+6+14)/8 + x = 9/2

29/8 +x = 9/2

x= 9/2 - 29/8

x= (36-29)/8

x=7/8

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3 years ago

Help- i dont understand Just 10 11 and 12 please!

katrin [286]

10. acute angles: 0
Right angles: 4
Obtuse angles: 0
Perpendicular lines: 0
Parallel lines: 2

11. Acute angles: 2
Right angles: 0
Obtuse angles: 1
Perpendicular lines: 0
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3 years ago

You are running a concession stand at a basketball game. You are selling hot dogs and sodas. Each hot dog costs $1.50 and each s

nikklg [1K]

Answer:

35 hotdogs and 52 sodas sold.

Step-by-step explanation:

x = the number of hotdogs sold, x>0

y = the number of sodas sold, y>0

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1.50x + 0.50y = 78.50

You sold a total of 87 hotdogs and sodas combined:

x + y = 87

We have the following system of equations:

1.50x + 0.50y = 78.50

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6 0

3 years ago

Amos is painting his pots. He needs 1/4 of a liter to paint all four pots. How much paint will he need for each of his 4 pots if

siniylev [52]

1/8 of a liter will be needed to fill all four pots

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3 years ago

Read 2 more answers

Find the a. MEAN and b. STANDARD DEVIATION for the data set. Round to two decimal places.

Dafna11 [192]

Answer:

Explained below.

Step-by-step explanation:

(10)

The data set is:

S = {124, 94, 129, 109, 114}

The mean and standard deviation are:

$\bar x=\frac{1}{n}\sum x=\frac{1}{5}\times [124+94+...+114]=114\\\\s=\sqrt{\frac{1}{n-1}\sum ( x-\bar x)^{2}}$

$=\sqrt{\frac{1}{5-1}\times [(124-114)^{2}+(94-114)^{2}+...+(114-114)^{2}]}\\=\sqrt{\frac{750}{4}}\\=13.6931\\\approx 13.69$

The correct option is B.

(11)

According to the Empirical 95% of the data for a Normal distribution are within 2 standard deviations of the mean.

So, the adult male's height is in the same range as about 95% of the other adult males whose heights were measured.

The correct option is B.

(12)

Let the score be X.

Given:

μ = 100

σ = 26

$X=\mu-2\sigma$

$=100-(2\times 26)\\=100-52\\=48$

The correct option is B.

(13)

Let X be the prices of a certain model of new homes.

Given: $X\sim N(150000, 2300^{2})$

Compute the percentage of buyers who paid between $147,700 and $152,300 as follows:

$P(147700$

$=P(-1$

According to the 68-95-99.7, 68% of the data for a Normal distribution are within 1 standard deviations of the mean.

The correct option is D.

(14)

Compute the percentage of buyers who paid more than $154,800 as follows:

$P(X>154800)=P(\frac{X-\mu}{\sigma}>\frac{154800-150000}{2400})$

$=P(Z>2)\\=0.975\\$

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The correct option is D.

(15)

The z-score is given as follows:

$z=\frac{x-\mu}{\sigma}$

5 0

3 years ago