You should be able to multiply 91 by 8 to get the sum of the first 8 tests, then add the score on the 9th test. Then to get the average of the sum of the 9 tests you need to divide it by 9.
((91*8)+78)/9=89.555555555555.... So, 90%

3 0

3 years ago

Answer plss. will mark the first correct answer as brainliest!!

Eva8 [605]

Answer:

(-1,-2, -3, -4)

Step-by-step explanation:

-15 < 3n <6

-15 < 3 (-1,-2, -3, -4) <6

3 • -1 = -3

3 • -2 = -6

3 • -3= - 9

3 • -4 = -12

so all these answer still make -15 the lowest value and 6 the highest value.

4 0

3 years ago

PLEASE PLEASE HELP ME PLEASE<br> Which radical expressions are equivalent to

VikaD [51]

Answer:

D and E

Step-by-step explanation:

Using the rule of radicals

$a^{\frac{m}{n} }$ ⇔ $\sqrt[n]{a^{m} }$

Given

$3^{\frac{4}{7} }$

= ( $\sqrt[7]{3}$ )^4 → D or

= $\sqrt[7]{3^{4} }$ = $\sqrt[7]{81}$ → E

7 0

3 years ago