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Sloan [31]
3 years ago
12

The price of a watch was increased by 20% to £198. What was the price before the increase?

Mathematics
2 answers:
tester [92]3 years ago
7 0

Answer:

£165

Step-by-step explanation:

\frac{198}{y} :\frac{120}{100}

y · 120 = 198 · 100

120y = 19800

120y ÷ 120 = 19800 ÷ 120

y = 165

£165

stich3 [128]3 years ago
4 0

Answer:

£165

Step-by-step explanation:

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Consider the following statement. Five less than 4 times a number equals 2 more than 3 times the number. a. Write an equation to
stich3 [128]
4n-5 = 3n+2  thats taking the word problem and writing it out
Now solve

4n-5=3n+2
n = 7
7 0
3 years ago
Read 2 more answers
Carlotta thinks that 3y + 5y3 is the same as 8y4. Which statement shows that it is NOT the same?
Vesna [10]

Answer:

C. 3(4) + 5(4)³ ≠ 8(4)⁴

Step-by-step explanation:

3y + 5y³ is NOT the same as 8y⁴

Assume y = 4

Not equal to sign ≠

3y + 5y³ ≠ 8y⁴

3(4) + 5(4)³ ≠ 8(4)⁴

12 + 20³ ≠ 32⁴

12 + 8000 ≠ 1,048,576

8012 ≠ 1,048,576

The statement which shows that 3y + 5y³ is NOT the same as 8y⁴ is 3(4) + 5(4)³ ≠ 8(4)⁴

4 0
2 years ago
The answers in my textbook show that using Soh Cah Toa is not right. Unless I'm doing it wrong. Can someone help me please?
Fiesta28 [93]

Answer:

(a) α = 60°, β = 30°

(b) α ≈ 67.4°, β ≈ 22.6°

Step-by-step explanation:

I'll do (a) and (b) as examples.  Make sure your calculator is set to degrees, not radians.

(a) For α, we're given the opposite and adjacent sides, so use tangent.

tangent = opposite / adjacent

tan α = √300 / 10

tan α = √3

α = 60°

Since angles of a triangle add up to 180°, we know that β = 30°.  But we can use tangent again to prove it:

tan β = 10 / √300

tan β = 1 / √3

tan β = √3 / 3

β = 30°

(b) For α, we're given the adjacent side and the hypotenuse.  So use cosine.

cos α = adjacent / hypotenuse

cos α = 15 / 39

cos α = 5 / 13

α ≈ 67.4°

Again, we know that β = 22.6°, but let's show it using trig.  We're given the opposite side and hypotenuse, so use sine:

sin β = 15 / 39

sin β = 5 / 13

β ≈ 22.6°

8 0
3 years ago
What are the zeros of 2x^2+17x=-21
enyata [817]

2x^2+17x+21=0\\D=17^2-4*2*21=121=11^2\\x_1=\frac{-17+11}{4} =-1,5\\x_2=\frac{-17-11}{4} =-7

zeros of 2x^2+17x=-21 are (-7;0) and (-1,5)

P.S. Hello from Russia

3 0
3 years ago
Which expression is equivalent to7sqrt x^2/ 5 sqrt y^3<br> ?Assume y/=0,
SOVA2 [1]

Answer:

7sq rt = 2.6457513110645907 = sqrt y^3

Step-by-step explanation:

8 0
3 years ago
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