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3 years ago

13

12. Joe counted 5 birch trees in the park. Sara counted 235 pine trees. How many times as many pine trees as birch trees did the

y count?

2 answers:

Fittoniya [83]3 years ago

7 0

Answer:

47

Step-by-step explanation: make sure to divide correctly

Helen [10]3 years ago

5 0

Answer:

47

Explanation:

If you multiply 5 time 47 it equals 235.

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The drama club is washing cars for a fundraiser if the rate continues how many cars will they wash in 4 hours

nlexa [21]

9 Cars washing in 4 hours

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3 years ago

(w^5 z^2 )(−9w^2 z^5)

Lady_Fox [76]

We have that
(w^5*z^2)*(-9*w^2*z^<span><span>5)</span>

</span><span>Multiplying exponential expressions
we know that
</span>w^5<span> multiplied by </span>w^<span>2 = w</span>^<span>(5 + 2) = w</span>^7
and
z^2<span> multiplied by </span>z^<span>5 = z</span>^<span>(2 + 5) = z</span>^7

therefore
(w^5*z^2)*(-9*w^2*z^5) =-9*( w^7)*( z^7)
-9*( w^7)*( z^7)=-(3^2)*( w^7)*( z^7)

the answer is
-(3^2)*( w^7)*( z^7

5 0

3 years ago

2x+3y=4<br> y = -3x + 20

natima [27]

Answer:

=-15

Step-by-step explanation:

Tiger solves YOUR Linear Equations step by step using the Substitution Method, showing work{-2x+3y=20;4x+4y=-15}

3 0

3 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.

5 0

2 years ago

Evaluate the expression when m= -2.8 and n=-6.3.<br> 4n - 6m

Alex73 [517]

Answer is 42, hope this helps

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2 years ago