2. circle the letter of each sentence that is true about numbers expressed in
scientific notation.
a. a number expressed in scientific notation is written as the product of a
coefficient and a power of 10.
b. the power of 10 is called the exponent.
c. the coefficient is always a number greater than or equal to one and less
than ten.
d. for numbers less than one, the exponent is positive.

explanation:

i did this but i forgot how to do it

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.