For question 1-4, find the simplified form of each expression. 1. (-3)^-4 (1 point) a. 12 b.-81 c.1/81 d.-1/81 2. (-7.4)^0 (1 point) a.-1 b.-7.4 c.0 d.1 3. -(5)^-1 (1point) a.-1/5 b.-5 c.5 d.1/5 4. simplify (1 point) -(3ab^2)^-3

1. C

2. D

3. A

4.

Step-by-step explanation:

To evaluate or simplify expressions with exponents, we use exponent rules.

We will use these rules to simplify.

1. Choice C.

2. Choice D.

3. Choice A.

4.

you can't solve x because it is 2 linear equation and you only have one equation

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation: