MATHEMATICS HIGH SCHOOL

Yusuf bought a DVD player for $280, now it is $220. What is the percent decrease in the price?​

Answers

Answer 1
Answer: 60 % because 280-220 gets you 60%
Answer 2
Answer:

Answer:

About 21.4%

Step-by-step explanation:

280 - 220 = 60

60 of 280 = ?

Variable x = percentage

60/280 = x/100

Cross multiply

60 × 100 = 280 × x

6000 = 280x

Divide both sides by 280

6000 ÷ 280 = 280x ÷ 280

21.428.... = x

About 21.4%

Check work:

60/280 = 21.4/100

Cross multiply

60 × 100 = 280 × 21.4

6000 = 5992

6000 is close to 5992

It does not equal exactly 6000 because I estimated the percentage to 21.4% instead of 21.428....%

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Which word describes a triangle with three angles, if each angle measures less than 90°?

Answers

Answer:

acute triangle

Step-by-step explanation:

A triangle with all angles less than 90 degrees has all angles that are acute.

Acute angles are less than 90 degrees

Which expression should be used to estimate the answer to this story problem?Marcus is reading a long novel. For 5 nights, he read 83 pages each night. How many pages did Marcus read?

A.90 × 5

B.90 ÷ 5

C.80 ÷ 5

D.80 × 5

Answers

D,because you would round down

If addenda are 170 and 130 what is the sum

Answers

The answer is 200 of 170

Greatest common factor of 28 and 42

Answers

Answer:

14

Step-by-step explanation:

Factors of 28: 1, 2, 4, 7, 14, 28

Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42

So, the GCF is 14

Which of the following statements have the same result? Explain each step in solving each one.f(1) when f(x) = 5x + 1
f−1(3) when f(x) = 2x plus 3, all over 5
3y − 7 = y + 5

Answers

f(x) = 5x + 1\n\nsubtitute\ x = 1\ to\ the\ equation\n\nf(1) = 5\cdot1 + 1 = 5 + 1 = 6\n----------------------\nf(x)=(2x+3)/(5)\to y=(2x+3)/(5)\ \ \ \ |multiply\ both\ sides\ by\ 5\n\n5y=2x+3\ \ \ \ |subtract\ 3\ from\ both\ sides\n\n2x=5y-3\ \ \ \ \ |divide\ both\ sides\ by\ 2\n\nx=(5y-3)/(2)\n\nf^(-1)(x)=(5\cdot(-1)-3)/(2)=(-5-3)/(2)=(-8)/(2)=-4\n---------------------\n3y-7=y+5\ \ \ |add\ 7\ to\ both\ sides\n3y=y+12\ \ \ \ |subtract\ y\ from\ both\ sides\n2y=12\ \ \ \ |divide\ both\ sides\ by\ 2\ny=6

Answer: f(1) when f(x) = 5x + 1 and 3y - 7 = y + 5

What is the answer to factorise 3D+12

Answers

well it should be like this tell me if im wrong, ↓


  3D + 12
  ___   ___

   3        3

so, hypo thinking once 3 is divided should leave you with . ↓

D = 4 cause once you do all the cancellations it basically leads 2 D then you have to divide →→ 12/3 → 3·4 or 4·3 either way it equals 12 sooo just do the math and you will come up with ...............................↓

-Hope this helped you any if not so comment  right answer D=4 :)
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