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2 years ago

Heike runs 800 meters every day. After 9 days, how many kilometers have Heike run? please help.

Mathematics

1 answer:

Nina [5.8K]2 years ago

8 0

Answer:

7.2 Kilometers

Step-by-step explanation:

800 meters = 0.8 kilometers

Therefore, do 0.8 x 9

0.8 x 9 = 7.2 kilometers

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Find the value of expression - 17x-19xpwer4 - 21x power 2,when x=3

Marrrta [24]

Answer:

$-17x - 19x^4 - 21x^2 = -1779$ when $x = 3$

Step-by-step explanation:

Given

$-17x - 19x^4 - 21x^2$

$x = 3$

Required

Solve

Substitute 3 for x in $-17x - 19x^4 - 21x^2$

$-17x - 19x^4 - 21x^2 = -17*3 - 19*3^4 - 21*3^2$

Evaluate all exponents

$-17x - 19x^4 - 21x^2 = -17*3 - 19*81 - 21*9$

$-17x - 19x^4 - 21x^2 = -51 - 1539- 189$

$-17x - 19x^4 - 21x^2 = -1779$

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3 years ago

5x-2y=11 and 3x+4y=4 Find the value of x and y in equation.

nadya68 [22]

5x-3y=11---(1)
3x+4y=4---(2)

(1)×3 and (2)×5

15x-9y=33-(3)
15x+20y=20-(4)

Subtract both

$\\ \sf\longmapsto -29y=13$

$\\ \sf\longmapsto y=\dfrac{-13}{29}$

Put in eq(1)

$\\ \sf\longmapsto 5x+\dfrac{-117}{29}=11$

$\\ \sf\longmapsto 5x=11+\dfrac{117}{29}=\dfrac{261+117}{29}=\dfrac{278}{29}$

$\\ \sf\longmapsto x=\dfrac{278}{145}$

7 0

2 years ago

Read 2 more answers

Margaret is saveing money for her sumergido vacation. Se calculates herstarting a Out is 0.4% of her total amount she wants to s

lubasha [3.4K]

Answer: 0.004 (you can ask Siri this question and get the same answer)

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2 years ago

The nth term of a sequence is n + 5 Work out the 5th term of the sequence. 5th term =

Ilya [14]

Answer:

Step-by-step explanation:

Tₙ=n+5

T₅=5+5=10

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2 years ago

HELP ME WITH THIS PLEASEEEEE

strojnjashka [21]

Use the metric relations,
AC*CD=BC^2
=>
5*CD=9^2
solve for CD
CD=9*9/5=16.2

7 0

3 years ago