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1 answer:

6 0

Do 2 hours on each one provided that the weekly allowance is given in which it is so when you multiply the wage by hours (2) and add the weekly allowance you get $28 for each one which is the same.

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Sung drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 10 hours. When Sung drove

liraira [26]

Sung drove to the mountains

s₁=speed when Sung drove to the mountains.
t=10 hour.
d=distance.

s₁=d/t
s₁=d/10 hour ⇒s₁=d/10 (1)

Sung drove home:
s₂=speed when Sung drove home.
t=7 hour

s₂=s₁+18 miles/hour
s₂=d/7 hour ⇒s₁+18 miles/h=d/7 hour ⇒ s₁+18=d/7 (2)

Whit the equations (1) and (2) make a system of equations:
s₁=d/10
s₁+18=d/7

we can solve this system of equations by substitution method.
d/10+18=d/7
least common multiple=70
7d+1260=10d
7d-10d=-1260
-3d=-1260
d=-1260/-3=420

Answer: distance= 420 miles.

7 0

4 years ago

3.Last year, the numbers of skateboards produced per day at a certain factory were normally distributed with a mean of 20,500 sk

TEA [102]

Let $X$ denote the number of skateboards produced daily.

$\mathbb P(X\ge20610)=\mathbb P\left(\dfrac{X-20500}{55}\ge\dfrac{20610-20500}{55}\right)=\mathbb P(Z\ge2)\approx0.0228=2.28\%$

$\mathbb P(X\le20445)=\mathbb P(\left(\dfrac{X-20500}{55}\le\dfrac{20445-20600}{55}\right)=\mathbb P(Z\le-2.818)\approx0.00242=0.242\%$