2 years ago

1 yard = 3 feet

Mathematics

1 answer:

Marina CMI [18]2 years ago

5 0

Answer: 20

Step-by-step explanation: 3 feet in 1 yard, there are 6 yards.

6 x 3 = 18 feet plus the 2 extra = 20 feet

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There were 685 hot air balloon pilots at a hot air balloon race. There were 1,570 more ground crew

Zielflug [23.3K]

Answer:

2225 I think just do 685+1570

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2 years ago

A 41 gram sample of a substance that's used to detect explosives has a k-value of 0.1392. Find the substance's half life, in day

-BARSIC- [3]

Answer:

The substance half-life is of 4.98 days.

Step-by-step explanation:

Equation for an amount of a decaying substance:

The equation for the amount of a substance that decay exponentially has the following format:

$A(t) = A(0)e^{-kt}$

In which k is the decay rate, as a decimal.

k-value of 0.1392.

This means that:

$A(t) = A(0)e^{-0.1392t}$

Find the substance's half life, in days.

This is t for which $A(t) = 0.5A(0)$ . So

$A(t) = A(0)e^{-0.1392t}$

$0.5A(0) = A(0)e^{-0.1392t}$

$e^{-0.1392t} = 0.5$

$\ln{e^{-0.1392t}} = \ln{0.5}$

$-0.1392t = \ln{0.5}$

$t = -\frac{\ln{0.5}}{0.1392}$

$t = 4.98$

The substance half-life is of 4.98 days.

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2 years ago

PLZ HELP ME Solve -2z – 5 > 3 for z.

Evgen [1.6K]

Answer:

z<-4

Step-by-step explanation:

-2z-5>3

Add 5 to both sides.

-2z>8

Divide both sides by -2.

Z<-4

The sign must change because you are dividing by a negative.

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2 years ago

Jennie is training for a race. On Tuesday She finished her sprint 0.305 second faster than on Monday. be How can you explain the

disa [49]

Have Monday equal to the variable X
Monday = X
Tuesday is 0.305 faster therefore
Tuesday = x+0.305

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2 years ago

Read 2 more answers

Which is a correct first step for solving this equation?<br> - 32 + 2 - 52 - 7 = 4x + 2

MArishka [77]

Answer:

-8x - 5 = 4x + 2

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2 years ago