Let the number of text messages be represented by X.
Then the total cost of David's cell phone adds up to
Since the total cost of David's phone equals $91.40, we get the following equation.
Subtract 50 on both sides
Divide both sides by 0.45
Therefore David has send 92 text messages.
4x + 3 = -5x - 7 Add 5x to both sides.
4x + 3 + 5x = -5x - 7 + 5x
9x + 3 = -7 Subtract 3 from both sides.
9x + 3 - 3 = -7 - 3
9x = -10 Divide both sides by 9
9x / 9 = -10 / 9
Your answer can either be 1.11111... or it would be x = -10/9
Answer: (3/10) in = (7/8) mi
1 in = (7/8) mi ÷ (3/10)
= 7/8 * (10/3) = 70/24
1 in = (70/24) mi
It means every 1 inch on the map drawing represents (70/24) miles ≈ 2.917 miles in reality.
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Answer:
y+4
Step-by-step explanation:
Erica used 50 pounds of type B coffee
Let the number of pounds of type A coffee be A
Let the number of pounds of type B coffee be B
Total number of pounds = 123
A + B = 123.........................................(1)
Cost of 1 pound of type A coffee = $5.95
Cost of 1 pound of type B coffee = $4.40
Total cost = $654.35
5.95A + 4.40B = 654.35..........................(2)
Make A the subject of the formula in equation (1)
A = 123 - B........................(3)
Substitute equation (3) into equation (2)
5.95(123 - B) + 4.40B = 654.35
731.85 - 5.95B + 4.40B = 654.35
5.95B - 4.40B = 731.85 - 654.35
1.55B = 77.5
B = 77.5/1.55
B = 50
Erica used 50 pounds of type B coffee
Learn more on system of equations here here: brainly.com/question/13729904
