Answer:
B) 1/2 pound
Step-by-step explanation:
Lawrence bought 2/3 pound of roast beef.
He used 3/4 of it to make a sandwich.
The amount of beef that he used for his sandwich is calculated as:
3/4 of 2/3 pounds of roast beef
3/4 × 2/3
= 6/12 pound
= 1/2 pound
Option B is the correct Option.
Answer:
V a s a q u e r e r o s e l a e S e c h o a l p e r r o
Answer:
∠ XWZ is a right angle.
Step-by-step explanation:
See the given diagram.
In triangle WXZ, WY is an altitude.
So, ∠ WYZ = ∠ XYW = 90°
Now, given that ∠ ZWY = ∠ WXY.
Now, from Δ XYW, since, ∠ XYW = 90° so, ∠ WXY + ∠ YWX = 90° ....... (1)
⇒ ∠ ZWY + ∠ YWX = 90° {Since, ∠ ZWY = ∠ WXY}
⇒ ∠ XWZ = 90°
Therefore, the angle XWZ is right angle. (Answer)
Answer:
a) 5.81
b) 25
Step-by-step explanation:
We are given the following in the question:
Sample size, n = 5
Population standard deviation, σ = 13 milligrams
a) standard deviation of Juan's mean result
5.81 is the standard deviation of Juan's mean result.
b) sample size such that the standard deviation reduces to 2.6
Thus, Juan has to repeat the experiment 25 times to reduce the standard deviation to 2.6
