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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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Maria wants to buy a new bicycle that costs $129.89. She has saved $78 of her babysitting money. Maria’s grandfather gave her $2
Makovka662 [10]

Answer:

more than what she has

Step-by-step explanation:

6 0
3 years ago
BRAINLIEST AND POINTS!!!<br><br> PLEASE EXPLAIN
timofeeve [1]

Answer:

Option C. \$23,134.61

Step-by-step explanation:

we know that

A=\frac{P[(1+r)^{n} -1]}{r(1+r)^{n}}

we have

P=\$400

r=0.075/12=0.00625

n=6*12=72\ months

substitute in the formula

A=\frac{400[(1+0.00625)^{72} -1]}{0.00625(1+0.00625)^{72}}\\ \\A=\frac{226.446972}{0.009788}\\ \\A=\$23,134.61

4 0
3 years ago
Find z of the diagonal triangle. <br> Also, complete b.
STatiana [176]

Answer:

x = 30.91 cm , y = 29,86 cm and z = 39.30 cm.

Total area of wood = 2942.54 cm^2.

Step-by-step explanation:

sin 15 =8/x

x = 8 / sin 15

x = 30.91 cm.

and

tan 15 = 8/y

y = 8 / tan 15

= 29.86 cm.

The value of z can be found using the Pythagoras theorem:

50^2 = x^2 + z^2

z^2 =  20^2 - x^2 = 50^2 - 30.91^2

z^2 = 1554.57

z = √1554.57

=  39.30 cm.

b.  The area consists of 3 rectangles :- 1. sides x and z  2. sides z and 8 and the other has sides z and y. Also 2 triangles of height 8 and base length y cm.

Total area = 30.91  * 39.30 + 8 * 39.30 + 29.86 * 39.30 + 2 * 0.5 * 8 * 29.86

=  2942.54 cm^2.

3 0
4 years ago
Which expression is equivalent to 4(2p+4q)
Alina [70]

Answer:

8p+16q

hope this helps

4x2p=8p

4x4q=16q

4 0
3 years ago
Didnt know wat subject it goes in is 98% of what you learn a waste
gregori [183]

Answer:

eh i mean sometimes thats a very broad statement though

5 0
4 years ago
Read 2 more answers
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