rob bought a magazine for $3 and five erasers, he spent a total of $13. How much did each eraser cost

Answers

Answer 1

Answer: You first do 13-3 because that’s how The magazine cost. You end with 10, then divided by five because you have five erasers. The answer is $2 per eraser.

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Which is a solution to the equation?(x - 3)(x - 5) = 35
x= -8
x=-5
x=2
x = 10

Answers

(x-3)(x-5)=35

Multiply the brackets together

x*x-5*x-3*x-3*5

x^2-8x+15=35

Move +35 to the other side. Sign changes from +35 to -35

x^2-8x+15-35=35-35

x^2-8x-20=0

(x-10)(x+2)=0

x-10=0 x+2=0

Move -10 to the other side. Sign changes from -10 to +10

x-10+10=0+10 x+2-2=0-2

x=10 x=-2

Answer: x=10

Answer: x = 10

Just plug in the different numbers to see which ones equal 35.

I’m going to plug in x = -8 into the equation
(x - 3)(x - 5) = 35
(-8 - 3)(-8 - 5) = 35 (substitute -8 for x)
(-11)(-13) = 35
143 = 35
This answer is wrong because 143 does not equal 35

Now let’s plug in x = 10
(x - 3)(x - 5) = 35
(10 - 3)(10 - 5) = 35 (substitute 10 for x)
(7)(5) = 35
35 = 35
This solution works because 35 equals 35

Simplify
2/5(a+b)+3/5(a+c)

Answers

distribute 2/5 and 3/5 into the ():
2/5(a+b)+3/5(a+c)

2/5 a+ 2/5 b+3/5 a+ 3/5 c

combine the like terms:
2/5 a+3/5 a= 5/5 a --> 1a --> a

new simplified equation:
a+2/5 b+3/5 c

Distribute

(2/5) (a) + (2/5) (b) + (3/5)(a) +(3/5)(c)

= 2/5a+2/5b+3/5a+3/5c

Combine like terms

2/5 a + 2/5 b + 3/5 a + 3/5 c

= ( 2/5 a + 3/5 a ) + ( 2/5 b) +(3/5 c)

= a + 2/5 b +3/5 c

I hope that's help !

Three out of every 10 pairs of skis sold by Snow Sports are cross-country skis. Snow Sports sold 450 pairs of skis during the winter season. How many of the skis were likely to have been cross-country skis?A 443(B) 135(C) 45D 30

Answers

The answer isnt c.
It is very simple. First divide 450 by 10
You get 45
This is the amount if there was only ONE SKI sold every 10

You have to multiply 45 by 3 to find the answer.

You will get 135

So the answer in fact is (B)

I hope i helped plese press 'thanks' :)

the answer is c. 45 you would divide 450 into 10

Andrew estimated the weight of his dog to be 60 lb. The dog’s actual weight was 68 lb.What was the percent error in Andrew’s estimate? Round your answer to the nearest tenth of a percent.

Answers

correct - wrong percentage
-------------------- = ---------------
wrong    100
68 - 60    x
--------- = ----
60 100
8   x
---- = ----
60 100
800    60x
----- = ----
60 60
13.3% = x

Which speed is the fastest? A) 18 feet in 20 minutes
B) 90 feet in 2.5 hours
C) 20 yards in 1.5 hours
D) 3 2/3 yards in 15 minutes