3 years ago

10. On the playground, Grace threw the ball 3 more feet than Ella. Grace threw the ball 21

Mathematics

1 answer:

Vlad1618 [11]3 years ago

5 0

Answer:

18ft

Step-by-step explanation:

21-3=18

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Dylan has 128 prices of candy from Halloween . he eats half of his candy each week.

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Answer:

55.5 left over.

Step-by-step explanation:

128/2 = 64

half each week so;

1 whole = two weeks

8 weeks = 8

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so, 64/8.5

is going to be 55.5 left.

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3 years ago

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Harry got 42 out of 49 correct in his test.

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Answer:

42/49 is the fraction

Step-by-step explanation:

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3 years ago

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Which equation is the inverse of y = 16x2 + 1?<br> | yi x=1

dsp73

so sixteen times 2 is 32 +1 is 33 so yi is 32 I think I'm not sure cause I dont get that

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3 years ago

A 10-foot ladder leans against a wall so that it is 6 feet high at the top. The ladder is moved so that the base of the ladder t

konstantin123 [22]

Answer:

The top of the ladder is now at 10 ft.

Step-by-step explanation:

At the start, we have a height H=6, a length L=10 and a base B, that has to be calculated by the Pythagorean theorem:

$B^2=L^2-H^2=10^2-6^2=100-36=64\\\\B=\sqrt{64}=8$

The base is moved twice the distance the height moves up.

We called this distance x, so we have:

$L^2=(H+x)^2+(B-2x)^2=H^2+2Hx+x^2+B^2-4Bx+4x^2\\\\L^2=(H^2+B^2)+5x^2+(2H-4B)x\\\\L^2=L^2+5x^2+(2H-4B)x\\\\0=5x^2+(2H-4B)x\\\\5x+(2H-4B)=0\\\\x=\dfrac{4B-2H}{5}=\dfrac{4*8-2*6}{5}=\dfrac{32-12}{5}=\dfrac{20}{5}=4$

The new height (H+x) is

$H'=H+x=6+4=10$

The base travels 2x=8, so the new base B' is 0.

This means that the ladder is all against the wall (L=H').

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3 years ago