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3 years ago

Multiply and then simplify completely: ( 8 + √ 10 ) ( 8 − √ 10 )

Mathematics

1 answer:

Temka [501]3 years ago

5 0

Answer:

54.

Step-by-step explanation:

( 8 + √ 10 ) ( 8 − √10)

= 8*8 - 8√10 + 8√10 +√10 * -√10

= 64 - 8√10 + 8√10 - 10

The 2 middle turns cancel out so we have:

64 - 10

= 54.

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How do I solve this?

Oliga [24]

×=4 since you divide 3 and 12 by 3
So it would be 13-16 (4×4)
Your answer is -3

4 0

3 years ago

Plz help! Sam had an appointment 90 miles away from home at 2pm. He drove there at 60 mph, and was 15 minutes late. What time di

never [62]

Answer:

12:45 pm

Step-by-step explanation:

First we find out the amount of time it takes to drive 90 miles at 60 mph.

speed = distance/time

time * speed = distance

time = distance/speed

time = 90 miles / 60 mph

time = 1.5 hour = 90 minutes

It takes 1.5 hour, or 90 minutes, to drive 90 miles at a speed of 60 mph.

To get there at 2:00 pm, he should have left at 12:30 pm.

He got there 15 minutes late, so he must have left 15 minutes late.

He left at 12:45 pm.

Answer: 12:45 pm

3 0

3 years ago

I Need Help Pls ASAP

wolverine [178]

We know that
∠ECD=∠ACB------> given in the problem
∠DEC=∠CAB------> 90°
so
∠EDC=∠ABC

therefore
triangles EDC and ABC are similar
<span>So
the ratio of the legs are equal</span>

$\frac{x}{9} = \frac{140-x}{81} \\ 81*x=9*(140-x) \\ 81x+9x=1260 \\ 90x=1260 \\ x=14$

$AC=140-x \\ AC=140-14 \\ AC=126$

the answer is
AC is equal to 126

7 0

4 years ago

10(x+9)-x What is the answer to this

kupik [55]

10(x+9)-x

Distribute

10x+90-x
9x+90
There it depends what it is equal to

For example 10(x+9)=x

Or 10(x+9)-x=0

6 0

3 years ago

Read 2 more answers

Please help me please I don’t understand and my teacher said I got it wrong for numbers 1 2 and 3

kirza4 [7]

Answer:

1) 5/9