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Zina [86]
3 years ago
5

Efectuati! (-1)+2+(-3)+4+(-5)+...+(-19)+20 Ajutati-ma, va rog!

Mathematics
1 answer:
alexira [117]3 years ago
8 0

Answer:10

Step-by-step explanation:

2+4+6+.....+20- (1+3+5+7+...+19)=(2-1)+(4-3)+(6-5)+....+(20-19)=1+1+...+1 ( de 10  ori= 10 times)

=10

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A boogie board that has a regular price of $69 is on sale at a 35% discount. What is the sale price with a 7% tax?
san4es73 [151]
You take 69 * 0.35 and then take that total (24.15) so 60-24.15= 35.85 then to find the tax take 35.85*.07=2.51 so your answer is 35.85+2.51=38.36
5 0
3 years ago
Need help with questions 23 & 25
BaLLatris [955]

23. You are expected to be familiar with the relationship

... cost + markup = selling price

a) cost + $23.99 = $119.95

... cost = $119.95 -23.99 = $95.96

b) The markup as a fraction of cost is

... markup/cost = $23.99/$95.96 = 0.25 = 25%

c) cost + markup = selling price . . . . the equation we started with

... cost/cost + markup/cost = (selling price)/cost . . . . divide by cost

... 100% + 25% = (selling price)/cost = 125%

25.

a) See part c) of problem 23. Selling price is 126% of cost.

b) Selling price = $450 × 1.26 = $567

c) Markup = $450 × 0.26 = $117

6 0
3 years ago
Solveby factoring : <br> p2 + 8p + 12 = 0<br> (show steps please)
kramer

Answer:

(p + 6)(p + 2)

Step-by-step explanation:

I believe you meant  p^2 + 8p + 12 = 0, in which " ^ " indicates exponentiation.

Note that 12 = 2*6, and that these two factors, 2 and 6, add up to 8.  Thus,

p^2 + 8p + 12 = 0 = (p + 6)(p + 2)

8 0
3 years ago
WORK OUT THE RELATIVE FREQUENCY AS A DECIMAL OF THROWING A 4
oee [108]

Answer:

0.666666667 (rounded)

Step-by-step explanation:

6 0
3 years ago
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Inessa [10]

Answer:

90

Step-by-step explanation:

The formula for a triangle is base times height then dividing it by 2

So 15 times 12 is 180 and dividing it by 2 gets you 90.

Hope this helps!

6 0
3 years ago
Read 2 more answers
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