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3 years ago

7

HURRY UP PLS

1 answer:

Vlada [557]3 years ago

5 0

B.12

90-30=60
60\5= 12

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In a parking lot with 250 parking spaces 40% how many of them are vacant and occupied

Darina [25.2K]

If that 40% is how many are occupied then- 100 are occupied 150 are vacant
if that 40% is how many are vacant then- 100 are vacant and 150 are occupied

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3 years ago

Johnny took a math test with 25 questions He answered 22 questions correctly in order to get an a he had to get 90% of them righ

zepelin [54]

Answer:

88%

Step-by-step explanation:

No Johnny boy did not

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3 years ago

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Which ratio best defines theoretical probability? Number of possible outcomes: Number of favorable outcomes Number of favorable

o-na [289]

Theoretical probability is probability based on reasoning written as a ratio of the number of favorable outcomes to the number of possible outcomes. Hope this helps w/process of elimination of your answers. :D

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3 years ago

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Find <img src="https://tex.z-dn.net/?f=a_%7B1%7D" id="TexFormula1" title="a_{1}" alt="a_{1}" align="absmiddle" class="latex-form

yKpoI14uk [10]

Answer:

$\displaystyle a_{1} = 108$

Step-by-step explanation:

we are given

the sum,common difference and nth term of a geometric sequence

we want to figure out the first term

recall geometric sequence

$\displaystyle S_{ \text{n}} = \frac{ a_{1}(1 - {r}^{n} )}{1 - r}$

we are given that

$S_n=189$
$r=\dfrac{1}{2}$
$n=3$

thus substitute:

$\displaystyle 189= \frac{ a_{1}(1 - {( \frac{1}{2} )}^{3} )}{1 - \frac{1}{2} }$

to figure out $a_1$ we need to figure out the equation

simplify denominator:

$\displaystyle \frac{ a_{1}(1 - {( \frac{1}{2} )}^{3} )}{ \dfrac{1}{2} } = 189$

simplify square:

$\displaystyle \frac{ a_{1}(1 - {( \frac{1}{8} )}^{} )}{ \dfrac{1}{2} } = 189$

simplify substraction:

$\displaystyle \frac{ a_{1} (\frac{7}{8} )}{ \frac{1}{2} } = 189$

simplify complex fraction:

$\displaystyle a_{1} (\frac{7}{8} ) \div { \frac{1}{2} } = 189$

calculate reciprocal:

$\displaystyle a_{1} \frac{7}{8} \times 2 = 189$

reduce fraction:

$\displaystyle a_{1} \frac{7}{4} \ = 189$

multiply both sides by 4/7:

$\displaystyle a_{1} \frac{7}{4} \times \frac{4}{7} \ = 189 \times \frac{4}{7}$

reduce fraction:

$\displaystyle a_{1} = 27\times 4$

simplify multiplication:

$\displaystyle a_{1} = 108$

hence,

$\displaystyle a_{1} = 108$

4 0

3 years ago

How much of a radioactive substance must be presented to decay to 40 grams in 9 years if the half-life of the substance is 4.6 y

leonid [27]

Answer:

155.25 grams

Step-by-step explanation:

40 = X(½^(9/4.6))

X = 40 ÷ (½^(9/4.6))

X = 155.25 grams

6 0

4 years ago