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LUCKY_DIMON [66]
3 years ago
8

Jake makes concrete by mixing cemente, sand and gravel in the ratio 4:2:1 work out the mass of the sand in 38.5kg of concrete mi

x
Mathematics
2 answers:
Dmitry_Shevchenko [17]3 years ago
8 0
You divide 38.5 by 7 then times your answer by 2
The answer is 1.4285kg
liubo4ka [24]3 years ago
6 0

Answer:

11kg

Step-by-step explanation:

In order to answer this question you need to find out how much cement, sand and gravel is needed to make 38.5g of concrete mix. To do this you must find out how many parts the concrete mix ratio is made up (4 + 2 + 1 = 7) Then divide the total concrete mix (38.5kg) by the number of parts; 38.5/7 = 5.5. This tells you that each of the 7 parts of the ratio = 5.5kg. As the ratio tells you sand is 2 parts you multiply this by 5.5 (2 x 5.5kg = 11kg).

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8x+y=300
Bond [772]
D. The elevator takes 37.5 seconds to move down to the lobby.


8x+y=300

y= 300-8x
y= 300 - 8 (37.5)

y = 300-300
y = 0

wheb y =0 that means that the height is 0
5 0
3 years ago
What is the distance between the points (10, -7) and ( 10, 9) on the coordinate plane?
xenn [34]
16 on the y-axis, 0 on the x axis
7 0
3 years ago
Dominic considers buying 2 points on a 25-year, fixed rate mortgage for $187,600. His interest rate will be 5.45% if he does not
algol [13]

Answer:

If Dominic buys 2 points (2% of the loan value) he will get a better rate and hence less payment.  The question is asking how long will it take him to save the initial investment of 2% of the loan value due to a smaller payment.  The monthly payment at 5.45% is  $1,146.43,  the monthly payment for 5.2% is  $1,118.66.  This is a difference of  $27.77 per month.  The 2 points will cost him  $3,752.00.  The question is asking how long will it take Dominic to re-coup his  $3,752.00 if he saves $27.77 per month.  Just divide the 2 numbers and you get  135.10 months.  If you divide that by 12 you get 11.26 years, which is roughly 11 years, 4 months.

Step-by-step explanation:

Here is what the question is asking.  If Dominic buys 2 points (2% of the loan value) he will get a better rate and hence less payment.  The question is asking how long will it take him to save the initial investment of 2% of the loan value due to a smaller payment.  The monthly payment at 5.45% is  $1,146.43,  the monthly payment for 5.2% is  $1,118.66.  This is a difference of  $27.77 per month.  The 2 points will cost him  $3,752.00.  The question is asking how long will it take Dominic to re-coup his  $3,752.00 if he saves $27.77 per month.  Just divide the 2 numbers and you get  135.10 months.  If you divide that by 12 you get 11.26 years, which is roughly 11 years, 4 months.

3 0
3 years ago
Can anyone help with these maths questions about transformations please?
salantis [7]
A. Reflection over y = 2

B. Reflection over y axis, reflection over y = 1

C. I'm guessing you just have to draw this one, just put the center on (2,0) and enlarge it by the scale factor
8 0
3 years ago
Carl bought 5 jars of relish at a cost of $1.76 per jar. He also bought 5 cans of tuna at a cost of $0.84 pre can . How much did
MArishka [77]
1.76x5=
8.8
So, carl spent $8.80 on relish
Hope this helps!
3 0
3 years ago
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