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Ray Of Light [21]
3 years ago
11

Please help! Thank you :)

Mathematics
2 answers:
AfilCa [17]3 years ago
7 0

Answer:

-10/3

Step-by-step explanation:

Gennadij [26K]3 years ago
7 0

Answer:

x=-10/3

Step-by-step explanation:

81=27^{-x-2} \\\\81=9^2=(3^2)^2=3^4\\\\27=9*3=3^3\\\\3^4=(3^3)^{-x-2}\\\\3^4=3^{3(-x-2)}\\\\3^4=3^{-3x-6}

as you see the bases are the same so the exponents must be the same too

4=-3x-6\\\\4+6=-3x\\\\10=-3x\\\\x=\frac{-10}{3}

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a study of the effects of exercis used rats bred to have high or low capacity for exercise. The 8 high capacity rats had mean bl
zavuch27 [327]

Answer:

t=-2.86

Step-by-step explanation:

From the question we are told that:

Sample 1 n_1=8

Sample 1 mean blood pressure \=x_1=89mmHg

Sample 1 variance \sigma_1=81

Sample 2 n_2=8

Sample 2 mean blood pressure \=x_2=105mmHg

Sample 2 variance \sigma_2=169

Generally the equation for the test of statistic is mathematically given by

t=\frac{\=x_1-\=x_2}{\sqrt{\frac{\sigma_2}{n_1}+\frac{\sigma_2}{n_2} } }

t=\frac{89-105}{\sqrt{\frac{81}{8}+\frac{169}{8} } }

t=-2.86

therefore the samples test for comparing the two population means

t=-2.86

3 0
3 years ago
What is the value of h(−2) when h(x)=3x+1 ?
scoray [572]
All you have to do is plug in the given number into the equation
h(x)=3x+1
h(x)=3(-2)+1
h(x)=-6+1
h(x)= -5
3 0
3 years ago
Investors buy a studio apartment for $200,000 . Of this​ amount, they have a down payment of $70,000. Their down payment is what
stiks02 [169]

Answer: 35%

Step-by-step explanation:

Percent of down payment

= 70,000 / 200,000 * 100

= 0.35 * 100

= 35%

<em>$70,000 is 35% of the purchase price of $200,000.</em>

4 0
3 years ago
tell whether the quotient is greater than or less than the dividend when you divide a whole number by a fraction . explain your
Fittoniya [83]
The quotient may be greater than or less than the dividend or divisor.
When the dividend is less than the divisor, the quotient will be less than one.
When the dividend is greater than the divisor, the quotient will be greater than one.
4 0
4 years ago
7. Find the value of x and the length of AB.
Ahat [919]

Answer:

length is 10 and X is 5

Step-by-step explanation:

A and D is 14 cm their opposite side is BC is 4 so AB is 10

X is 2x=10

X=10/2

X=5

7 0
2 years ago
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