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Lady_Fox [76]
3 years ago
13

Joan is 5 years older than Ellen, and 3 years ago the sum of their ages was 17 years. In how many years will Joan be 21 years ol

d?
Mathematics
1 answer:
slavikrds [6]3 years ago
5 0

Answer:

7

Step-by-step explanation:

If J is Joan's current age and E is Ellen's current age, then:

J = E + 5

(J - 3) + (E - 3) = 17

Solve the first equation for E:

E = J - 5

Substitute into the second:

(J - 3) + (J - 5 - 3) = 17

J - 3 + J - 8 = 17

2J - 11 = 17

2J = 28

J = 14

Joan is 14, so in 7 years, she will be 21.

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PLEASE HELP I'M SORRY FOR A LOT OF QUESTIONS but I need help ​
deff fn [24]

Answer:

Hello! answer: 268 square meters

Step-by-step explanation:

To find the total surface area you find the area of each face then add them up so...

10 × 3 = 30

10 × 3 = 30

8 × 3 = 24

8 × 3 = 24

10 × 8 = 80

10 × 8 = 80

Now that I found the area for each face I will just add them up so...

30 + 30 + 24 + 24 + 80 + 80 = 268 therefore the area is 268 square meters Hope that helps!

5 0
3 years ago
Read 2 more answers
A store applies a 120% markup to an item and sells it for $80.08. What was the value of the item before the markup was added?
Artemon [7]

Answer:

66.7333

Step-by-step explanation:

if 120 =80.08 what about 100

100×80.08÷120

=66.733

5 0
3 years ago
The difference of two numbers is 44 1/2 . If the smaller of the two numbers increases 7 times then the difference will be 10 3/1
Kobotan [32]
Answer: The smaller number is 9 and 5/42. The larger number is 53 and 13/21.

To find these answer you have to write the following two equations.

x - y = 44 and 1/2
7y - x = 10 and 3/14

Then, you can use the substitution method to solve them. Change the first equation to: x = 44 + y. Substitute that into the second equation and solve for y. Once you have that, plug it back into the first equation and solve for x.
8 0
3 years ago
sum of the two angle is equal to 90 degree the ratio of measure of these is 4:5 I what are the measures of these two angle​
a_sh-v [17]

9x =90

x=90/9

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4 0
3 years ago
Eliana drove her car 81 km, space, k, m and used 9 liters of fuel. She wants to know how many kilometers(x) she can drive on 22
olya-2409 [2.1K]

Question: Eliana drove her car 81 km, space, k, m and used 9 liters of fuel. She wants to know how many kilometers(x) she can drive on 22 liters of fuel. She assumes her car will continue consuming fuel at the same rate. How far can Eliana drive on 222222 liters of fuel?

Answer: Eliana can drive on 22 liters of fuel and can drive up to 198 km

Explanation: 9 liters = 81km so 81 divided by 9  so now it becomes 1 liter =9km  22 liters so 22x9 = 198km

question answered by

(jacemorris04)

8 0
3 years ago
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