If the storybook cost $20, and it was also 2/5 of his money, then 2/5 of his money is $20. In other words:
2x/5 =20.
Multiplying both sides by 5, we get:
2x = 100.
If we divide both sides by 2, then we're left with:
x = 50.
David had $50 at first.
Answer:
The triangle is a right triangle.
Step-by-step explanation:
Since The Pythagorean Theorem only works on right triangles, we can use this knowledge to prove whether this triangle is right:
Therefore, the triangle is right.
Answer:
2
Step-by-step explanation:
Answer:
Step-by-step explanation:
The probability that x >17 will be found as follows:
the z-score is given by:
z=(17-15.2)/0.9=2
Thus
P(X>17)=1-P(x<17)=P-(z=2)
=1-0.9772
=0.0228