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Anastaziya [24]

4 years ago

12

The science department buys the equipment shown in the table.They bought all three items this year.In how many years will they h

ave to buy all three items again? Microscopes-every 5 years, Safety goggles- every 4 years, Test tubes-every 2 years

1 answer:

pishuonlain [190]4 years ago

7 0

In 20 years because its asking for the least common multiple

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Help fast !!!!!!!!!!!

Semmy [17]

Answer:

tbh I think its the middle one

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

What is the solution to this system of equations? 2t + w = 10 4t = 20 − 2w A. It has no solution. B. It has infinite solutions.

joja [24]

Answer:

<h3>B. It has infinite solutions</h3>

Step-by-step explanation:

Given the system of equations:

2t + w = 10 ..... 1

4t = 20 − 2w ... 2

From 1:

w = 10-2t ...3

Substitute 3 into 2 to have;

4t = 20 - 2(10-2t)

4t = 20-20+4t

4t = 4t

Let t = k

Substitute t = k into 1 and get w;

From 1: 2t + w = 10

2k + w =10

w = 10 - 2k

<em>k can take any integers. This shows that the solution to the equation is infinite</em>

<em></em>

7 0

3 years ago

Brian had 42 class fair tickets to sell. He sold 5/6 of the tickets. How many tickets did Brian sell?

Hunter-Best [27]

Answer:

35

Step-by-step explanation:

8 0

3 years ago

Use addition properties and strategies to find the sum 27 + 68 + 43

NeX [460]

One hundred thirty eight

5 0

4 years ago

If the random variable X is normally distributed with a mean of 75 and a standard deviation of 8, then P(X ≥ 75) is:a. 0.500b. 0

drek231 [11]

Answer:

a. 0.5

Step-by-step explanation:

We know that X follows normal distribution with

mean=75

standard deviation=8

$P(X\geq 75)=P(\frac{x-mean}{standard deviation}\geq \frac{75-75}{8})$

$P(X\geq 75)=P(Z\geq 0)$

$P(Z\geq 0)=$ P(0<Z<∞)

The area under the normal curve is 1 and the (0<Z<∞) =0.5 and (-∞<Z<0) =0.5

So, P(0<Z<∞)=0.5

Hence the P(X ≥ 75)=0.5

5 0

4 years ago