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4 years ago

Rewrite the expression 7 to the -2 power

Mathematics

2 answers:

liberstina [14]4 years ago

8 0

Answer:

(7)^-2

Step-by-step explanation:

hope this helps

iris [78.8K]4 years ago

5 0

Answer:

1/49

Step-by-step explanation:

7^-2

1/49

7^2 is usually 49 for negative exponents just flip it

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Question 4 fast please

Daniel [21]

Answer:

X=-10

Step-by-step explanation:

Collinear points are points on the same line.

Use the equation of gradient to find the gradient. Then use the gradient to find X

$\frac{Y2-Y1}{X2-X1}=Gradient of a slope$

$\frac{2-(-4)}{3-0}=\frac{2+4}{3}=\frac{6}{3}=2$

$\frac{x+4}{-3-0}=2$

Multiply both sides of the equation to get rid of the fraction.

$\frac{x+4}{-3}*-3 =2*-3$

x+4=-6

x=-6-4

x=-10

7 0

3 years ago

Please help me to do this question with steps

Anarel [89]

Answer:

x = 71°

Step-by-step explanation:

Segments of tangents from the same external point are congruent, that is

AT = BT

Then Δ ABT is isosceles with base angles congruent , so

x = $\frac{180-38}{2}$ = $\frac{142}{2}$ = 71°

8 0

3 years ago

The terminal side of an angle θ in standard position is in quadrant 1. If sinθ=0.8, find cosθ.

Aloiza [94]

Answer:

$cos\theta=\frac{3}{5}$

Step-by-step explanation:

Since $sin\theta=0.8$ is the same as $sin\theta=\frac{4}{5}$ and $sin\theta=\frac{opposite}{hypotenuse}$ , then we know that the side opposite to the angle $\theta$ is 4 units and the hypotenuse is 5 units.

Because $cos\theta=\frac{adjacent}{hypotenuse}$ , then we have to find the adjacent side to the angle $\theta$ using the Pythagorean Theorem:

$a^2+b^2=c^2\\\\(adjacent)^2+(opposite)^2=(hypotenuse)^2\\\\(adjacent)^2+4^2=5^2\\\\(adjacent)^2+16=25\\\\(adjacent)^2=9\\\\adjacent=3$

Therefore, since the adjacent side is 3 units, then $cos\theta=\frac{3}{5}$

7 0

3 years ago

Write 6,000,370 in scientific notation.

adell [148]

First count the number of digits after the first one 6 This = 6 and is the exponent of 10 so the required notation is

6.000370 * 10^6

4 0

3 years ago

Read 2 more answers

Assume that all grade-point averages are to be standardized on a scale between 0 and 6. How many grade-point averages must be

yanalaym [24]

Answer:

The sample size 'n' = 72,030

Step-by-step explanation:

Step(i):-

Given that the Estimate Error = 0.013

Given that the standard deviation of the Population = 1.5

The estimated error is determined by

$E = \frac{Z_{0.98} S.D }{\sqrt{n} }$

Step(ii):-

Given that the Level of significance = 0.98 or 0.02

Z₀.₀₂ = 2.326

The estimated error is determined by

$E = \frac{Z_{0.98} S.D }{\sqrt{n} }$

$0.013 = \frac{2.326 X 1.5 }{\sqrt{n} }$

$\sqrt{n} = \frac{3.489}{0.013} = 268.38$

Squaring on both sides, we get

n = 72,030

Final answer:-

The sample size 'n' = 72,030

7 0

3 years ago