Question

An expression is shown.

​

​ 2.1×105 + 4.3×104

​

​Which expression is equivalent?


A

2.53×104

B

2.53×105

C

6.4×105

D

6.4×109

Answer 1

Answer:

25.3 × $10^{4}$ is the equivalent expression

Step-by-step explanation:

In this question, we are asked to select from the options the expression that is equivalent to the written expression.

2.1 × $10^{5}$  + 4.3 * $10^{4}$

Now, we can factor out $10^{4}$.

This gives;

$10^{4}${[2.1 × 10] + 4.3}

$10^{4}$( 21 + 4.3)

= $10^{4}$ × 25.3