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Softa [21]
2 years ago
14

Please show workings on how to do it :)

Mathematics
2 answers:
Korvikt [17]2 years ago
7 0

Answer:

here

Step-by-step explanation:

ratio:

1x, 3x, 5x=180

9x=180

x=180/9

x=20

forgot to mention 1x=cement

3x=sand and 5x=gravel.

I only know first part of the question.

arsen [322]2 years ago
5 0

Answer:

Let the ratio be x,3x,5x

then,

or,x+3x+5x=180kg

or,9x=180

or,x=180/9

or,x=20kg

now,3x=3*20

=60kg

5x=5*20

=100 kg

therefore he doesn't have enough cement and sand but he has enough gravel.

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Please Help! Look at the picture attached.
-BARSIC- [3]

Answer:

23-x=5

X= 18

that's the answer

3 0
3 years ago
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What is parallel to y= 4x + 2
alexgriva [62]

Answer:

y = 4x

Step-by-step explanation:

When two lines are parallel, their slopes are equal. The slope in this equation is 4. Therefore, any line with slope 4 will suffice.

3 0
2 years ago
In a study of the stability of IQ scores, a large group of individuals is tested once at age 18 and again at age 35. The followi
Naddika [18.5K]

Answer:

112

Step-by-step explanation:

Given that in a study of the stability of IQ scores, a large group of individuals is tested once at age 18 and again at age 35.

Age 18: average score = 100, SD = 15

Age 35: average score = 100, SD = 15, r = 0.80

Let us obtain regression equation of y on x.

Let y be the scores at age 35 and x at age 18

Slope = r(s_y/s_x) = 0.8(\frac{15}{15} )=0.80

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Hence regression line would be

y-100=0.8(x-100)\\y = 0.8x+20

a) Here given that x =115

Hence y=0.80(115)+20\\=112

the average score at age 35 for all the individuals who scored 115 at age 18, would be 112.

b) Prediction also would be the same 112.

5 0
3 years ago
Tyler has 45% of his pay check remaining. What fraction of his pay check does he have remaining?
Andreyy89

Answer:

If he has 45% of his cheak remaining we already have the remaining so we just to turn it into a fraction

First we put it over 100

<u>45</u>

100

Then we reduce it to the lowest terms

which would be

9/20

7 0
2 years ago
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What is (16x+9)+(−9x−5) ?
seropon [69]

Answer:

7+4

Step-by-step explanation:

hope it helps

8 0
2 years ago
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