Hermione buys 9/10 of a pound of plums. the plums cost $1.30 per pound. how much does hermione spend on plums? $0.90 $1.17 $1.30 $11.70

In this question, we're trying to find how much Hermione spent on plums.

We know that:

With the information above, we can solve the question.

Since we know that plums cost $1.30 per pound and Hermione bought 9/10 of a pound, we would multiply 1.30 by 0.90 in order to get the price Hermione bought the plums for. Hermione is pretty much paying 90% of the cost of a pound.

When you multiply, you should get 1.17

This means that Hermione spent $1.17 on 9/10 pound of plums.

$1.17

Step-by-step explanation:

To find the amount of money she spends on plums, take the cost of plums times the fractional number of pounds

1.30 *9/10

11.7/10

1.17

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15