MATHEMATICS COLLEGE

4x (7+8) = (4x _) + (4x _)

Answers

Answer 1

Answer:

Answer:

4x (7+8)=(4x3) + (4x4)

4x(7+8)=(4x7) +(4x8)

Step-by-step explanation:

Im not sure with one tho

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What is 75miles/hr in feet/second?(1mile = 5280feet)

Answers

Answer:

110 feet/sec

Step-by-step explanation:

75 miles x 5280 feet

= 396000

396000/60 min

=6600

6600/60 secs

=110 feet/second

A microwave is placed on top of a stand. The stand is 2 feet 10 inches tall, and the microwave is 3 feet 3 inches tall. Together, how tall are they?Write your answer in feet and inches. Use a number less than 12 for inches.

Answers

Answer:

6 feet 1 inch tall

Step-by-step explanation:

10 inch + 3 inch is 13 inch which is equal to 1 foot 1 inch

2 feet + 3 feet is 5 feet and if we add 5 feet to 1 foot and 1 inch, it will be equal to 6 feet 1 inch.

It takes 60
pounds of seed to completely plant an
8
-acre field. How many acres can be planted per pound of seed?

Answers

the answer i got was 7.5

I believe it requires 7.5 pounds of seed per acre. So 1 acre equals 7.5 pounds of seed.

A dealer advertises that a certain brand of tire averages 50,000 miles of use before needing to be replaced. Testing this claim, an investigator finds that a sample of 19 randomly selected tires from this dealer had an average lifespan of 48,700 miles with a standard deviation of 4,500 miles. Assume tire life spans are approximately normally distributed. At the α = 0.05 level, find if the investigator can prove the dealer is exaggerating the average lifespan of their tires by performing the hypothesis test.

Answers

Answer:

100k miles

Step-by-step explanation:

A disease has hit a city. The percentage of the population infected t days after the disease arrives is approximated by p(t)equals7 t e Superscript negative t divided by 13 for 0less than or equalstless than or equals39. After how many days is the percentage of infected people a maximum? What is the maximum percent of the population infected?

Answers

Answer:

t = 13 days

p(13) = 33.47%

Step-by-step explanation:

p(t) is the percentage of the population infected:

p(t) = 7*t*e∧(-t / 13)

where 0 ≤ t ≤ 39 days

we can apply p'(t) = 0 to get number of days where the percentage of infected people is maximum:

p'(t) = (7*t*e∧(-t / 13))' = 7*(t*e∧(-t / 13))' = 7*((t)'*e∧(-t / 13)+t*(e∧(-t / 13)') = 0

⇒ 7*(1*e∧(-t / 13)+t*e∧(-t / 13)*(-1 / 13)) = 7*e∧(-t / 13)*(1 - (t / 13)) = 0

∴ 1 - (t / 13) = 0 ⇒ t = 13 days

then we get the maximum percent of the population infected as follows

p(13) = 7*13*e∧(-13 / 13)

⇒ p(13) = 33.47%

A package of 6 pairs of insulated socks costs $34.14. What is the unit price of the pairs of socks?

Answers

Answer:

$\boxed {\tt \$5.69 \ per \ pair}$

Step-by-step explanation:

We want to find the unit price for the insulated socks, or the price per pair of insulated socks. To find the unit price, we must divide the cost by the pairs of socks.

$unit \ price =(cost)/(pairs)$