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4 years ago

Which expression is equivalent to 30 (1/2 x - 2) + 40(3/4 y-4)

Mathematics

1 answer:

Xelga [282]4 years ago

8 0

Answer:

Step-by-step explanation:

Start by removing the brackets.

Left Brackets

30(1/2 x - 2)

30*1/2 x - 30*2

15x - 60

Right Bracket

40(3/4 y - 4)

40*3/4 y - 4*40

10*3 y - 160

30y - 160

Now put these 2 results together.

15x - 60 + 30y - 160 Combine the like terms.

15x + 30y - 220 That's one answer Others are possible.

5(3x + 6y - 44)

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Given: CB bisects

marin [14]

Answer:

Answer to fourth part is :

Angle ABC= Angle DBC

So for fifth part reason answer is ASA congruency.

Step-by-step explanation:

Here we are given that CB bisects angle ABD and angle ACD.

So we have ,

Angle ABC= Angle DBC

Answer to fourth part is :

Angle ABC= Angle DBC

Now here we have two angles and one side equal in two triangles.

So we can say that ASA congruency fits in the best here.

So for fifth part reason answer is ASA congruency.

4 0

4 years ago

-6(-6q - 9q + 1) -3q

Dovator [93]

Answer:

87q-6

sorry if i am incorrect.

Step-by-step explanation:

4 0

3 years ago

Ignore them workings out.<br> Can someone show me how to work this out

Readme [11.4K]

So, i did this,
7.8*10=70
and then add 12
i got 82
did this help??

7 0

3 years ago

A mixture of compounds X and Y in a 0.100-cm cell had an absorbance of 0.215 at 272 nm and 0.191 at 327 nm. Find [X] and [Y] in

Oksi-84 [34.3K]

Answer: The concentration of X is $7.13582\times 10^{-6}$ and the concentration of Y is $2.53159\times 10^{-5}$ .

Step-by-step explanation:

Since we have given that

At 272 nm, absorbance = 0.215

At 327 nm, absorbance = 0.191

As we have given that

Compound X Compound Y

272 16400 3870

327 3990 6420

So, our equations becomes

$16400C_1+3870c_2=0.215\\\\3990C_1+6420C_2=0.191$

By solving these two equations, we get that

$C_1=7.13582\times 10^{-6}\\\\C_2=2.53159\times 10^{-5}$

Hence, the concentration of X is $7.13582\times 10^{-6}$ and the concentration of Y is $2.53159\times 10^{-5}$ .

5 0

4 years ago

Find the surface area of this rectangular prism. Be sure to include the correct unit in your answer.

Sav [38]

Answer:

126in

Step-by-step explanation:

6*5=30

5*3=15

6*3=18

30+15+18 = 63

63*2=126

7 0

3 years ago

Read 2 more answers