Question 1:
the two sides are both 21 making this an isoceles triangle. In an isoceles triangle not only are two sides the same, but the bottom two angles are as well.
We know a triangle has 180°. We know the top Angle is 38° and the bottom two are the same.
we can setup an equation like this
2x + 38 = 180.
Subtract 38: 2x = 142
Divide by 2: x = 71
question 2:
the hash marks on the two sides mean they are the same length. So we are dealing with an isoceles triangle again.
Since the bottom two angles are the same, we know Angle B is also 47°.
Knowing that 180° are in a triangle, and the two 47° angles make up 94°, we know the top Angle is 86°.
The two curve lines at the top represent that those angles are the same. since we know that whole top Angle is 86, we divide that by two.
86 / 2 = 43. so y = 43°
to find x, we once again know 180° in a triangle. so take the 47° from the corner and the 43° from the top to find x.
47 + 43 + x = 180
Subtract 47 & 43: x = 90
Answer:
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The Solution:
Given:
Plan A:
Each text sent or received cost $0.10.
If x=number of texts sent or received in a month, the total cost is:
Plan B:
Users pay a fixed charge of $12 and an additional $0.02 for each text sent or received. So, we have the expression for the total charges as:
Part (a)
Writing the inequality that shows that to use plan A is cheaper than using plan B, we have:
Part (b)
Solving the inequality in part (a) above, we have:
Dividing both sides by 0.08, we have:
Therefore, the correct answer is [option 2]
Answer:
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Answer: 1st one
Step-by-step explanation:
look at it