Using the numbers 8, 6, 4 write an expression that equals 7

Answers

Answer 1

Answer:

$(8-4)/(4)+6=(4)/(4)+6=1+6=7$

$8-(8-6)/(6-4)=8-(2)/(2)=8-1=7$

$(8+6)/(6-4)=(14)/(2)=7$

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Emily and Sarah had a total of $80. After Sarah spent 1/3 of her money and Emily spent $17, Emily had twice as much money as Sarah. How much more money did Emily have than Sarah at first?

Answers

Emily = E
Sarah = S

At the end

E = 2S (Because Emily has double Sarah)
E -> E + 17 (To make up the $17 she spent)
2S -> 3S (Because 2S is two thirds the amount Sarah had, as she spent a third)
E + 17 + 3S = 80 (Because their original amounts were equal to $80)
E + 3S = 63 (Simplifying equation)

I think Emily had 3x as much as Sarah

Suppose the lengths of the lengths of two strings are 10 centimeters and 17 centimeters. Describe how the lengths of these two strings compare.

Answers

-- The lengths of the two strings are not equal.
They are different.

-- The 10-centimeter string is shorter than the 17-centimeter one.

-- The 17-centimeter string is longer than the 10-centimeter one.

(I'll bet you knew all of those things, but you were
afraid to say them because it's math and everybody
thinks that math is hard. Am I right ?)

Let's just say that the string that is 10 cm long is string A and the string that is 17 cm long is string B. Because 10 < 17, string A is shorter than string B. Conversely, because 17 > 10, string B is longer than string A.

Which expression is equivalent to 2+y+y+y+y+y+3 ?

Answers

Answer:5y+5

Step-by-step explanation:

2+y+y+y+y+y+3

Collect like terms

y+y+y+y+y+3+2

5y+5

A contractor charges $1,200 for 100 square feet of roofing installed. At this rate, how much does it cost to have 1,100 square feet installed?

Answers

Answer: $13200

Step-by-step explanation:

If 100 square feet of roofing is installed for a cost of $1,200

1,100 square feet would cost $Z (let the unknown cost be Z)

i.e 100 ft^2 = $1,200

1100 ft^2 = $Z

Hence, to get the value of Z, cross multiply

Z x 100 = 1200 x 1100

100Z = 130000

Divide both sides by Z

100Z/100 = 1320000/100

Z = $13200

Thus, $13200 is the cost to have 1,100 square feet of roofing sheet installed

(1/5)^(x+1)=125 how do I solve this?

Answers

Answer:

X=-4

Step-by-step explanation:

In the attached file

What is the solution to the equation? 5(8 + 7) = 5 • x + 5 • 7 A. x = 1 B. x = 5 C. x = 7 D. x = 8

Answers

$5(8+7)=5\cdot x+5\cdot7\n\nx=8\n\nAnswer:D\n\n5\cdot x+5\cdot7=\underline{5}\cdot x+\underline{5}\cdot7=\underline{5}\cdot(x+7)=5\cdot(8+7)\iff x=8$

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