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Troyanec [42]
3 years ago
12

3/4 + 1/3x = 6 Solve for x

Mathematics
2 answers:
n200080 [17]3 years ago
4 0

\frac{3}{4}  +  \frac{1}{3}x = 6

Multiply both sides of the equation by 12

9 + 4x = 72

Move constact to the right-hand side and chancge it's sign.

4x = 72 - 9

Subtranct the numbers

4x = 63

Divide both sides the equation by 4

Solution:

x =  \frac{63}{4}

Alternate Form:

x = 15 \frac{3}{4} x = 15.75

ehidna [41]3 years ago
3 0
Just subtract 3/4 from both sides that divide 1/3 and x to get your answers
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Brass is made up of copper and zinc. 100 grams of brass contains 20 grams of zinc.
Nana76 [90]

Answer:

A.  12 grams Zn

B.  280 g of copper.

Step-by-step explanation:

100 grams of brass

20 grams of zinc

100 grams of brass has 20 grams of Zn.

20/100 = 0.200  Zn   <u>20% Zn  and 80% copper</u>.

A.  (60 g brass)*(0.2) = 12 grams Zn

B.  (350 g brass)*(0.80) = 280 g of copper.

5 0
2 years ago
Find the product of (-8) and (-13)
KiRa [710]
To find this you can always use a calculator, if your teacher allows you to. Just remember to punch in the negative signs correctly and don't mistake them for subtraction signs. Also if you don't know what product means, that means the answer of a multiplication problem so for example 9 is the product of 3x3 or 5 is the product of 5x1. The answer to your question is 104. Maybe next time you can solve it on your own! :) 
4 0
3 years ago
If the coefficient of determination for a data set is 0.75 and the SSE for the data set is 13, what is the SST for the data set?
nadya68 [22]
Answer : SSE = 9
r^2 = 0.75
r^2 = 1 - (SSE/SST)
SSE/SST = 1 - r^2 = 1 - 0.75 = 0.25
<span>SST = 9/0.25 = 36</span>
8 0
3 years ago
Read 2 more answers
Find the area of a trapezium whose parallel sides are 28.7 cm and 22.3 cm and distance between parallel sides is 16 cm.
puteri [66]

Given:

The parallel sides of a trapezium are 28.7 cm and 22.3 cm.

The distance between parallel sides is 16 cm.

To find:

The area of a trapezium.

Solution:

The area of the trapezium is:

A=\dfrac{a+b}{2}h

Where, a,b are parallel sides and h is the vertical distance between the parallel sides.

Putting a=28.7, b=22.3,h=16 in the above formula, we get

A=\dfrac{28.7+22.3}{2}\times(16)

A=\dfrac{51}{2}\times 16

A=51\times 8

A=408

Therefore, the area of the trapezium is 408 square cm.

4 0
3 years ago
Colin invests £1500 into a savings account. The bank gives 4% compound interest for the first 3 years and 5% thereafter. How muc
fomenos

1500(1+0.04)^3 = 1687.30

1687.30(1+0.05) = 1771.67 to the nearest pound: 1772

6 0
2 years ago
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