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3 years ago

PLZ HELP ME

Mathematics

1 answer:

valentina_108 [34]3 years ago

7 0

Answer:

Four less than an unknown value: E

Quotient of a variable and 4: A

Some number to the power of four: B

Four times an unknown value: C

Four more than some number: D

Step-by-step explanation:

You honestly could do it by yourself, it just consists of matching the operation

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Samantha has 1/3 hour to finish 4 chores if she divides the time equally how much time will she spend on each chore

Artyom0805 [142]

1 hour = 60 minutes

60/3 is 20 minutes

20/4 is 5 minutes

Samantha spends 5 minutes on each chore

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4 years ago

Read 2 more answers

I really need help with this ASAP 71 POINTS

e-lub [12.9K]

Working is a bit of a mess, but vertically she's correct, but she's incorrect horizontally

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3 years ago

Write an equivalent expression for each question

Mandarinka [93]

Answer:

A. 16 - 4 x = 4(4 - x)

B. 4 x + 8 = 4( x + 2)

C. -8 b - 24 = -8(b + 3)

D. 54 + 9 x = 9 (x + 6)

Step-by-step explanation:

Here, the given expressions are:

A. 16 - 4 x

Now, 16 and 4 have 4 as their COMMON FACTOR.

⇒Taking out 4 as the factor, we get: 16 - 4 x = 4 ( 4 - x)

Hence, the equivalent expression of 16 - 4 x = 4 ( 4 - x)

B. 4x + 8

Now, 4 and 8 have 4 as their COMMON FACTOR.

⇒Taking out 4 as the factor, we get: 4 x + 8 = 4 ( x + 2)

Hence, the equivalent expression of 4 x + 8 = 4 ( x + 2)

C. -8b - 24

Now, -8 and -24 have (-8) as their COMMON FACTOR.

⇒Taking out (-8) as the factor, we get: -8b - 24 = (-8) ( b+ 3)

Hence, the equivalent expression of -8b - 24 = (-8) ( b+ 3)

D. 54 + 9x

Now, 54 and 9 have (9) as their COMMON FACTOR.

⇒Taking out (9) as the factor, we get: 54 + 9 x = 9( 6 + x)

Hence, the equivalent expression of 54 + 9 x = 9( 6 + x)

4 0

3 years ago

The average test score of RSM students in September increased by 10%. In October it increased by another 15%. By what percent di

irina [24]

Answer:

26.5%

Step-by-step explanation:

Increasing Percentages

When sequential percentages increasing are computed, each increase applies to the previous result, instead of the first quantity. That is why sometimes the final results may be confusing. For example, increasing 10% and then 15% will not be the same as increasing a total of 25%.

The average test scores of RSM students first increased by 10%. It means that some quantity C increased by

$10C/100=0.1C$

Now the average test scores are

$C+0.1C=1.1C$

A new increasing occurred by 15%, and the previous quantity must be multiplied by 1.15, so the final average test scores are

$1.15(1.1C)=1.265C$

It means that the total increasing was $100(1.265-1)=26.5\%$

4 0

3 years ago

Let f(x) = x2 - 81. Find f-1(x).

aalyn [17]

The answer is 1) ± √x+81

Step 1: Substitute y for f(x). 
Step 2: Since every (x, y) has its partner (y, x)y switch x and y.
Step 3: Solve for y.

Step 1.
The function is: f(x) = x² - 81
Substitute y for f(x): y = x² - 81

Step 2.
Switch x and y: x = y² - 81

Step 3.
Solve for y (which is now f⁻¹(x)): f⁻¹(x) = y
x = y² - 81
y² = x + 81
y = +-√(x+81)

Therefore, the choice 1) is correct.

5 0

3 years ago