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Alborosie
3 years ago
9

What is Evaluate 4/5-3/7​

Mathematics
1 answer:
kkurt [141]3 years ago
7 0

Answer:

\frac{13}{35}

Step-by-step explanation:

To add or subtract two or more fractions from each other, the denominators have to be the same. To make the denominators the same, we should find the least common multiple of 5 and 7. The least common multiple of 5 and 7 is 35. 5 should be multiplied with 7 to get 35 and 7 should be multiplied with 5 to get 35 (with both numerators).

\frac{4}{5 }  -  \frac{3}{7}

\frac{4  \times 7}{5 \times 7}  -  \frac{3 \times 5}{7 \times 5}

\frac{28}{35}  -  \frac{15}{35}

\frac{13 }{35}

When subtracting, only subtract the numerators (the denominators are kept as is).

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In a psychology class, 32 students have a mean score of 93.2 on a test. Then 16 more students take the test and their mean score
liraira [26]

Answer:  83.3

Step-by-step explanation:

Formula :

\text{Mean}=\dfrac{\text{Sum of all observations}}{\text{Number of observations}}                   (1)

\Rightarrow\ \text{Sum of all observations}=\text{Mean x (Number of observations)}           (2)

Given : In a psychology class, 32 students have a mean score of 93.2 on a test.

By Using (2) , Sum of scores of 32 students = 93.2 x 32 =2982.4   (3)

Then 16 have a mean score of 63.4.

Again, By Using (2) , Sum of scores of 16 students = 63.4 x 16 =1014.4   (4)

Total students = 32+16 = 48

Add (3) and (4) , we get combined score of 48 students = 2982.4+ 1014.4

=3996.8

Now , by using (2) , the  mean score of all of these students together

=\dfrac{3996.8}{48}=83.2666666667\approx83.3

Hence, the mean score of all of these students together is 83.3.

4 0
3 years ago
Brenda earns $1,700 per month after taxes. She is working on her budget and has the first three categories finished.
Zigmanuir [339]

Answer:

B

Step-by-step explanation:

Recommended for housing: 30%

X/100 = 612/1700

= 36%

Recommended for food: 10%

X/100 = 238/1700

= 14%

Recommended for transportation 15%

X/100 = 370/1700

= 21.8%

6 0
3 years ago
Using the table find g(x) and use that to find g(-10)
Sloan [31]
Hope this is a help for u
3x
30

5 0
3 years ago
12. Name the property the equation illustrates.
Vesnalui [34]

the answer is A. the commutative property of addition. this property states that no matter what order you put the numbers, the outcome will be the same.

Hope this helps!

4 0
3 years ago
What is the value of x with clear working out please?
nirvana33 [79]

Answer:

Answer: <u> </u><u>x</u><u> </u><u>is</u><u> </u><u>4</u><u>6</u><u>°</u><u> </u>

Step-by-step explanation:

• Let's first find Angle ACB

{ \rm{ \angle ACB + 23 \degree + 90 \degree = 180 \degree}} \\  \\ { \rm{ \angle ACB = (180 - 90 - 23) \degree}} \\  \\ { \underline{ \rm{ \:  \angle ACB = 67 \degree}}}

• From alternative angles, x = Angle BAC.

• Since AB = AC, then Angle ABC = Angle ACB

{ \rm{x +  \angle ABC +  \angle ACB = 180 \degree}} \\  \\ { \rm{x + 67 \degree + 67 \degree = 180 \degree}} \\  \\ { \rm{x + 134 \degree = 180 \degree}} \\  \\ { \boxed{ \rm{x = 46 \degree}}}

5 0
3 years ago
Read 2 more answers
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